• 118 elements
  • Checked September 2026

Periodic Table Quiz

Tap or click the cell of each element it names on a blank table.

Periodic Table Quiz

Name Date

Phosphorus: tap its cell

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118

Top: group numbers · Left: period numbers · In each box: the atomic number

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Write the name of each numbered element.Answer key

  1. Hydrogen
  2. Helium
  3. Lithium
  4. Beryllium
  5. Boron
  6. Carbon
  7. Nitrogen
  8. Oxygen
  9. Fluorine
  10. Neon
  11. Sodium
  12. Magnesium
  13. Aluminum
  14. Silicon
  15. Phosphorus
  16. Sulfur
  17. Chlorine
  18. Argon
  19. Potassium
  20. Calcium
  21. Scandium
  22. Titanium
  23. Vanadium
  24. Chromium
  25. Manganese
  26. Iron
  27. Cobalt
  28. Nickel
  29. Copper
  30. Zinc
  31. Gallium
  32. Germanium
  33. Arsenic
  34. Selenium
  35. Bromine
  36. Krypton
  37. Rubidium
  38. Strontium
  39. Yttrium
  40. Zirconium
  41. Niobium
  42. Molybdenum
  43. Technetium
  44. Ruthenium
  45. Rhodium
  46. Palladium
  47. Silver
  48. Cadmium
  49. Indium
  50. Tin
  51. Antimony
  52. Tellurium
  53. Iodine
  54. Xenon
  55. Cesium
  56. Barium
  57. Lanthanum
  58. Cerium
  59. Praseodymium
  60. Neodymium
  61. Promethium
  62. Samarium
  63. Europium
  64. Gadolinium
  65. Terbium
  66. Dysprosium
  67. Holmium
  68. Erbium
  69. Thulium
  70. Ytterbium
  71. Lutetium
  72. Hafnium
  73. Tantalum
  74. Tungsten
  75. Rhenium
  76. Osmium
  77. Iridium
  78. Platinum
  79. Gold
  80. Mercury
  81. Thallium
  82. Lead
  83. Bismuth
  84. Polonium
  85. Astatine
  86. Radon
  87. Francium
  88. Radium
  89. Actinium
  90. Thorium
  91. Protactinium
  92. Uranium
  93. Neptunium
  94. Plutonium
  95. Americium
  96. Curium
  97. Berkelium
  98. Californium
  99. Einsteinium
  100. Fermium
  101. Mendelevium
  102. Nobelium
  103. Lawrencium
  104. Rutherfordium
  105. Dubnium
  106. Seaborgium
  107. Bohrium
  108. Hassium
  109. Meitnerium
  110. Darmstadtium
  111. Roentgenium
  112. Copernicium
  113. Nihonium
  114. Flerovium
  115. Moscovium
  116. Livermorium
  117. Tennessine
  118. Oganesson

Drawn by code for this site from the layout of the IUPAC Periodic Table of the Elements. Licence: own work.

Each element is a button. Use the arrow keys to move between them and Enter to choose. Names are read out in Study, and once a element is answered.

Next step A shorter round: only the first 20 elementsFrom elements to stars: the astronomy quiz

All 118 elements on the diagram

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Periods 1 to 3 18

  1. Hydrogen Symbol H, atomic number 1. A nonmetal in period 1, group 1, and a gas at room temperature. Its Greek name means water-forming. It is the lightest element, which is why it comes first.
  2. Helium Symbol He, atomic number 2. A noble gas in period 1, group 18, and a gas at room temperature. Named from the Greek word for the sun. It has the lowest boiling point of any element, 4.22 kelvin.
  3. Lithium Symbol Li, atomic number 3. An alkali metal in period 2, group 1. Named from the Greek word for stone. It is the least dense metal.
  4. Beryllium Symbol Be, atomic number 4. An alkaline earth metal in period 2, group 2. Named after the mineral beryl.
  5. Boron Symbol B, atomic number 5. A metalloid in period 2, group 13. Named after the mineral borax.
  6. Carbon Symbol C, atomic number 6. A nonmetal in period 2, group 14. Its name comes from carbo, the Latin word for coal.
  7. Nitrogen Symbol N, atomic number 7. A nonmetal in period 2, group 15, and a gas at room temperature. Its Greek name means niter-forming.
  8. Oxygen Symbol O, atomic number 8. A nonmetal in period 2, group 16, and a gas at room temperature. Its Greek name means acid-forming.
  9. Fluorine Symbol F, atomic number 9. A halogen in period 2, group 17, and a gas at room temperature. Named from the Latin word fluo, to flow. It is the first of the halogens.
  10. Neon Symbol Ne, atomic number 10. A noble gas in period 2, group 18, and a gas at room temperature. Its name is the Greek word for new.
  11. Sodium Symbol Na, atomic number 11. An alkali metal in period 3, group 1. Its English name comes from soda. Its symbol comes from natrium, the Neo-Latin name.
  12. Magnesium Symbol Mg, atomic number 12. An alkaline earth metal in period 3, group 2. Named after Magnesia, a district of Thessaly in Greece.
  13. Aluminum Symbol Al, atomic number 13. A post-transition metal in period 3, group 13. Named after alum, a bitter salt. British spelling gives the name one more i and one more syllable.
  14. Silicon Symbol Si, atomic number 14. A metalloid in period 3, group 14. Named from silex, the Latin word for flint.
  15. Phosphorus Symbol P, atomic number 15. A nonmetal in period 3, group 15. Its Greek name means light-bearing.
  16. Sulfur Symbol S, atomic number 16. A nonmetal in period 3, group 16. Its name comes straight from Latin. British books spell it with ph where American books use f.
  17. Chlorine Symbol Cl, atomic number 17. A halogen in period 3, group 17, and a gas at room temperature. Named from the Greek word for greenish yellow.
  18. Argon Symbol Ar, atomic number 18. A noble gas in period 3, group 18, and a gas at room temperature. Its name is Greek for idle, because it is inert.

Period 4 18

  1. Potassium Symbol K, atomic number 19. An alkali metal in period 4, group 1. Its English name comes from potash, pot plus ash. Its symbol comes from kalium, the Neo-Latin name.
  2. Calcium Symbol Ca, atomic number 20. An alkaline earth metal in period 4, group 2. Named from calx, the Latin word for lime.
  3. Scandium Symbol Sc, atomic number 21. A transition metal in period 4, group 3. Named after Scandinavia.
  4. Titanium Symbol Ti, atomic number 22. A transition metal in period 4, group 4. Named after the Titans, the children of Gaia and Ouranos in Greek myth.
  5. Vanadium Symbol V, atomic number 23. A transition metal in period 4, group 5. Named after Vanadis, a name of the Norse goddess Freyja.
  6. Chromium Symbol Cr, atomic number 24. A transition metal in period 4, group 6. Named from the Greek word for color.
  7. Manganese Symbol Mn, atomic number 25. A transition metal in period 4, group 7. Its name is a corruption of magnesia negra, so it is easily mixed up with element 12.
  8. Iron Symbol Fe, atomic number 26. A transition metal in period 4, group 8. Its symbol comes from ferrum, the Latin name.
  9. Cobalt Symbol Co, atomic number 27. A transition metal in period 4, group 9. Named after the kobold, a goblin of German folklore.
  10. Nickel Symbol Ni, atomic number 28. A transition metal in period 4, group 10. Named after a mischievous sprite from the tales of German miners.
  11. Copper Symbol Cu, atomic number 29. A transition metal in period 4, group 11. Its symbol comes from the Latin cuprum, a name taken from the island of Cyprus.
  12. Zinc Symbol Zn, atomic number 30. A transition metal in period 4, group 12. Its name most likely comes from Zinke, a German word for a prong or tooth.
  13. Gallium Symbol Ga, atomic number 31. A post-transition metal in period 4, group 13. Named after Gallia, the Latin name for France. It melts at about 30 degrees Celsius.
  14. Germanium Symbol Ge, atomic number 32. A metalloid in period 4, group 14. Named after Germania, the Latin name for Germany.
  15. Arsenic Symbol As, atomic number 33. A metalloid in period 4, group 15. Its name goes back to a Greek word for a yellow mineral pigment.
  16. Selenium Symbol Se, atomic number 34. A nonmetal in period 4, group 16. Named from the Greek word for the moon.
  17. Bromine Symbol Br, atomic number 35. A halogen in period 4, group 17. Named from the Greek word for stench. It is one of only two elements that are liquid at room temperature.
  18. Krypton Symbol Kr, atomic number 36. A noble gas in period 4, group 18, and a gas at room temperature. Its name is Greek for hidden.

Period 5 18

  1. Rubidium Symbol Rb, atomic number 37. An alkali metal in period 5, group 1. Named from rubidus, Latin for deep red.
  2. Strontium Symbol Sr, atomic number 38. An alkaline earth metal in period 5, group 2. Named after Strontian, the Scottish village where it was found.
  3. Yttrium Symbol Y, atomic number 39. A transition metal in period 5, group 3. One of four elements named after the Swedish village of Ytterby. Its name starts with the same two letters as the village.
  4. Zirconium Symbol Zr, atomic number 40. A transition metal in period 5, group 4. Named after the mineral zircon.
  5. Niobium Symbol Nb, atomic number 41. A transition metal in period 5, group 5. Named after Niobe, King Tantalus's daughter in Greek myth. Element 73, directly below, is named after her father.
  6. Molybdenum Symbol Mo, atomic number 42. A transition metal in period 5, group 6. Its name comes from a Greek word for lead, because its ore was confused with lead ore.
  7. Technetium Symbol Tc, atomic number 43. A transition metal in period 5, group 7. Its name is Greek for artificial. It has no standard atomic weight.
  8. Ruthenium Symbol Ru, atomic number 44. A transition metal in period 5, group 8. Named after Ruthenia, a Neo-Latin name for Russia.
  9. Rhodium Symbol Rh, atomic number 45. A transition metal in period 5, group 9. Named from the Greek word for rose-colored.
  10. Palladium Symbol Pd, atomic number 46. A transition metal in period 5, group 10. Named after Pallas, an asteroid that was counted as a planet at the time.
  11. Silver Symbol Ag, atomic number 47. A transition metal in period 5, group 11. Its symbol comes from argentum, the Latin name.
  12. Cadmium Symbol Cd, atomic number 48. A transition metal in period 5, group 12. Named after cadmia, a Neo-Latin word for calamine that goes back to King Cadmus of Thebes.
  13. Indium Symbol In, atomic number 49. A post-transition metal in period 5, group 13. Named after the indigo blue line seen in its spectrum.
  14. Tin Symbol Sn, atomic number 50. A post-transition metal in period 5, group 14. Its symbol comes from stannum, the name the Romans gave it.
  15. Antimony Symbol Sb, atomic number 51. A metalloid in period 5, group 15. Its symbol comes from stibium, a Latin word. The origin of its English name is unclear.
  16. Tellurium Symbol Te, atomic number 52. A metalloid in period 5, group 16. Named from tellus, the Latin word for the ground or the earth.
  17. Iodine Symbol I, atomic number 53. A halogen in period 5, group 17. Named from the Greek word for violet.
  18. Xenon Symbol Xe, atomic number 54. A noble gas in period 5, group 18, and a gas at room temperature. Its name is Greek for strange or foreign.

Period 6 32

  1. Cesium Symbol Cs, atomic number 55. An alkali metal in period 6, group 1. Named from caesius, Latin for sky-blue. British books spell it with an extra a after the C.
  2. Barium Symbol Ba, atomic number 56. An alkaline earth metal in period 6, group 2. Named from the Greek word for heavy.
  3. Lanthanum Symbol La, atomic number 57. A lanthanide in period 6, shown in the upper row below the table. Its name comes from the Greek for to lie hidden. The whole row is named after it.
  4. Cerium Symbol Ce, atomic number 58. A lanthanide in period 6, shown in the upper row below the table. Named after Ceres, which was counted as a planet at the time.
  5. Praseodymium Symbol Pr, atomic number 59. A lanthanide in period 6, shown in the upper row below the table. Its Greek name means green twin.
  6. Neodymium Symbol Nd, atomic number 60. A lanthanide in period 6, shown in the upper row below the table. Its Greek name means new twin.
  7. Promethium Symbol Pm, atomic number 61. A lanthanide in period 6, shown in the upper row below the table. Named after Prometheus, a Titan of Greek myth. It has no standard atomic weight.
  8. Samarium Symbol Sm, atomic number 62. A lanthanide in period 6, shown in the upper row below the table. Named after the mineral samarskite, which honors a Russian mine official.
  9. Europium Symbol Eu, atomic number 63. A lanthanide in period 6, shown in the upper row below the table. Named after a continent. Element 95, directly below it, copies the idea.
  10. Gadolinium Symbol Gd, atomic number 64. A lanthanide in period 6, shown in the upper row below the table. Named after the mineral gadolinite, which honors the Finnish chemist Johan Gadolin.
  11. Terbium Symbol Tb, atomic number 65. A lanthanide in period 6, shown in the upper row below the table. One of four elements named after the Swedish village of Ytterby. Its name starts with T.
  12. Dysprosium Symbol Dy, atomic number 66. A lanthanide in period 6, shown in the upper row below the table. Its name is Greek for hard to get.
  13. Holmium Symbol Ho, atomic number 67. A lanthanide in period 6, shown in the upper row below the table. Named after Holmia, the Neo-Latin name for Stockholm.
  14. Erbium Symbol Er, atomic number 68. A lanthanide in period 6, shown in the upper row below the table. One of four elements named after the Swedish village of Ytterby. Its name starts with E.
  15. Thulium Symbol Tm, atomic number 69. A lanthanide in period 6, shown in the upper row below the table. Named after Thule, the ancient name for a land somewhere in the far north.
  16. Ytterbium Symbol Yb, atomic number 70. A lanthanide in period 6, shown in the upper row below the table. One of four elements named after the Swedish village of Ytterby. Its name keeps the most letters of the village.
  17. Lutetium Symbol Lu, atomic number 71. A lanthanide in period 6, shown in the upper row below the table. Named after Lutetia, the Latin name for Paris.
  18. Hafnium Symbol Hf, atomic number 72. A transition metal in period 6, group 4. Named after Hafnia, the Neo-Latin name for Copenhagen.
  19. Tantalum Symbol Ta, atomic number 73. A transition metal in period 6, group 5. Named after King Tantalus of Greek myth, the father of Niobe.
  20. Tungsten Symbol W, atomic number 74. A transition metal in period 6, group 6. Its name is Swedish for heavy stone, and its symbol comes from its other name, wolfram. No metal has a higher melting point.
  21. Rhenium Symbol Re, atomic number 75. A transition metal in period 6, group 7. Named after Rhenus, the Latin name for the Rhine.
  22. Osmium Symbol Os, atomic number 76. A transition metal in period 6, group 8. Named from the Greek word for smell. It is the densest element.
  23. Iridium Symbol Ir, atomic number 77. A transition metal in period 6, group 9. Named after Iris, the Greek goddess of the rainbow.
  24. Platinum Symbol Pt, atomic number 78. A transition metal in period 6, group 10. Its name comes from platina, Spanish for little silver.
  25. Gold Symbol Au, atomic number 79. A transition metal in period 6, group 11. Its symbol comes from aurum, the Latin name.
  26. Mercury Symbol Hg, atomic number 80. A transition metal in period 6, group 12. Named after the Roman god known for his speed. Its symbol comes from hydrargyrum, which means water-silver. It is liquid at room temperature.
  27. Thallium Symbol Tl, atomic number 81. A post-transition metal in period 6, group 13. Named from the Greek for a green shoot or twig.
  28. Lead Symbol Pb, atomic number 82. A post-transition metal in period 6, group 14. Its symbol comes from plumbum, the Latin name.
  29. Bismuth Symbol Bi, atomic number 83. A post-transition metal in period 6, group 15. Its name comes from the German word Wismut.
  30. Polonium Symbol Po, atomic number 84. A metalloid in period 6, group 16. Named after Polonia, the Latin name for Poland, the home country of its discoverer Marie Curie.
  31. Astatine Symbol At, atomic number 85. A halogen in period 6, group 17. Its name is Greek for unstable. It has no stable isotopes.
  32. Radon Symbol Rn, atomic number 86. A noble gas in period 6, group 18, and a gas at room temperature. Its name comes from radium emanation, the first name given to it.

Period 7 32

  1. Francium Symbol Fr, atomic number 87. An alkali metal in period 7, group 1. Named after the home country of its discoverer, Marguerite Perey.
  2. Radium Symbol Ra, atomic number 88. An alkaline earth metal in period 7, group 2. Marie Curie coined its name from radius, the Latin word for ray.
  3. Actinium Symbol Ac, atomic number 89. An actinide in period 7, shown in the lower row below the table. Named from the Greek word for ray. The whole row is named after it.
  4. Thorium Symbol Th, atomic number 90. An actinide in period 7, shown in the lower row below the table. Named after the Norse god of thunder.
  5. Protactinium Symbol Pa, atomic number 91. An actinide in period 7, shown in the lower row below the table. Its name means before element 89, because it decays into that element.
  6. Uranium Symbol U, atomic number 92. An actinide in period 7, shown in the lower row below the table. Named after the seventh planet.
  7. Neptunium Symbol Np, atomic number 93. An actinide in period 7, shown in the lower row below the table. Named after the eighth planet.
  8. Plutonium Symbol Pu, atomic number 94. An actinide in period 7, shown in the lower row below the table. Named after Pluto, which was counted as a planet at the time.
  9. Americium Symbol Am, atomic number 95. An actinide in period 7, shown in the lower row below the table. Named after the Americas, where it was first made, to match the element directly above it.
  10. Curium Symbol Cm, atomic number 96. An actinide in period 7, shown in the lower row below the table. Named after Pierre and Marie Curie.
  11. Berkelium Symbol Bk, atomic number 97. An actinide in period 7, shown in the lower row below the table. Named after the city in California where it was first made.
  12. Californium Symbol Cf, atomic number 98. An actinide in period 7, shown in the lower row below the table. Named after the U.S. state where it was first made.
  13. Einsteinium Symbol Es, atomic number 99. An actinide in period 7, shown in the lower row below the table. Named after Albert, the German-born physicist.
  14. Fermium Symbol Fm, atomic number 100. An actinide in period 7, shown in the lower row below the table. Named after the Italian physicist Enrico.
  15. Mendelevium Symbol Md, atomic number 101. An actinide in period 7, shown in the lower row below the table. Named after the Russian chemist who devised the periodic table.
  16. Nobelium Symbol No, atomic number 102. An actinide in period 7, shown in the lower row below the table. Named after Alfred, the Swedish chemist and engineer.
  17. Lawrencium Symbol Lr, atomic number 103. An actinide in period 7, shown in the lower row below the table. Named after the American physicist Ernest, whose surname begins with L. It is the last of the actinides.
  18. Rutherfordium Symbol Rf, atomic number 104. A transition metal in period 7, group 4. Named after Ernest, a physicist and chemist from New Zealand.
  19. Dubnium Symbol Db, atomic number 105. A transition metal in period 7, group 5. Named after Dubna, the Russian town where it was discovered.
  20. Seaborgium Symbol Sg, atomic number 106. A transition metal in period 7, group 6. Named after the American chemist Glenn.
  21. Bohrium Symbol Bh, atomic number 107. A transition metal in period 7, group 7. Named after the Danish physicist Niels.
  22. Hassium Symbol Hs, atomic number 108. A transition metal in period 7, group 8. Named after Hassia, the Neo-Latin name for the German state of Hesse.
  23. Meitnerium Symbol Mt, atomic number 109. A transition metal in period 7, group 9. Named after the Austrian physicist Lise.
  24. Darmstadtium Symbol Ds, atomic number 110. A transition metal in period 7, group 10. Named after the German city where it was first made, in the GSI laboratories.
  25. Roentgenium Symbol Rg, atomic number 111. A transition metal in period 7, group 11. Named after the German physicist Wilhelm, whose surname is spelled with an umlaut in German.
  26. Copernicium Symbol Cn, atomic number 112. A transition metal in period 7, group 12. Named after the Polish astronomer Nicolaus.
  27. Nihonium Symbol Nh, atomic number 113. Period 7, group 13, so it is grouped with the post-transition metals. Named after Nihon, the Japanese word for Japan, where it was first made.
  28. Flerovium Symbol Fl, atomic number 114. Period 7, group 14, so it is grouped with the post-transition metals. Named after a nuclear laboratory in Russia, itself named after the physicist Georgy Flyorov.
  29. Moscovium Symbol Mc, atomic number 115. Period 7, group 15, so it is grouped with the post-transition metals. Named after the capital of Russia.
  30. Livermorium Symbol Lv, atomic number 116. Period 7, group 16, so it is grouped with the post-transition metals. Named after a national laboratory in California.
  31. Tennessine Symbol Ts, atomic number 117. Period 7, group 17, so it is grouped with the halogens. Named after a U.S. state, the home of Oak Ridge National Laboratory.
  32. Oganesson Symbol Og, atomic number 118. Period 7, group 18, so it is grouped with the noble gases. Named after the Russian physicist Yuri. It is the last element on the table so far.

How this list was compiled: Names, symbols, atomic numbers and the 18-column layout checked on 2026-09-19 against the IUPAC Periodic Table of the Elements dated 4 May 2022, https://iupac.org/what-we-do/periodic-table-of-elements/. Categories and the state of each element at room temperature are from the PubChem periodic table, https://pubchem.ncbi.nlm.nih.gov/periodic-table/, read the same day. Name origins, densities, melting and boiling points are from https://en.wikipedia.org/wiki/List_of_chemical_elements, read the same day. Hints and detail lines were written for this site. Licence: own work

The drawing: Drawn by code for this site from the layout of the IUPAC Periodic Table of the Elements (4 May 2022), https://iupac.org/what-we-do/periodic-table-of-elements/. Only the arrangement is taken from it; the drawing is new. Licence: own work

How it works

This periodic table quiz starts from a blank table: 118 cells that show only their atomic numbers. In Find it an element is named and you tap or click the cell where it belongs. In Name it a cell lights up and you give the element, by name or by symbol. Start with Periods 1 to 3. At the end, the main button brings back your misses.

Read the full guide

Three ways to work the table

Find it names an element and you tap where it goes. A wrong tap tells you which element you touched, so even a miss teaches you a cell. It also shows the answer and counts a miss. Name it lights one cell. Answer with 4 choices or with Type it. Symbols count, so Na is as good as Sodium. Study writes every name on the table, and each element's note gives its symbol, number, period, group and one fact.

Start small: rows first, then families

The sets under Start from cut a round down by row: periods 1 to 3 (18 elements), period 4 (18), period 5 (18), then periods 6 and 7 with 32 each. Or take one family: 6 alkali metals, 6 alkaline earth metals, 38 transition metals, 11 post-transition metals, 7 metalloids, 7 other nonmetals, 6 halogens, 7 noble gases, 15 lanthanides and 15 actinides. Typical periodic table quiz questions ask where an element sits, what its symbol is and which family it is in, and each note answers all three.

The five tints and the two lower rows

The blank table has five light tints so the big blocks stand out: groups 1 and 2, the transition metals with the two lower rows, the post-transition metals, the metalloids, and the nonmetals with the halogens and noble gases. The lanthanides and actinides sit below the main table, 15 in each row. Group numbers run along the top and period numbers down the left side.

  • Fix the corners first: Hydrogen top left, Helium top right, Francium bottom left and Oganesson bottom right. Everything else hangs between them.
  • Use the number printed in each cell. Carbon is element 6, so it is the sixth cell when you read the table left to right, row by row.
  • Eleven symbols come from Latin or German names: Na, K, Fe, Cu, Ag, Sn, Sb, W, Au, Hg and Pb. Press Type it and answer by symbol until they stop surprising you.
  • Take the halogens and the noble gases as two short rounds. Together they are 13 elements, and they fill the last two columns.
  • At the end of a round, press Practise the 2 you missed to retry them.

Questions and answers

Which version of the periodic table does this quiz follow?

The IUPAC Periodic Table of the Elements dated 4 May 2022, which has 118 named elements. Names, symbols and atomic numbers were also compared with the PubChem periodic table. The four newest names are Nihonium (113), Moscovium (115), Tennessine (117) and Oganesson (118), and all four are in the quiz.

Why Aluminum, Cesium and Sulfur, not Aluminium, Caesium and Sulphur?

The quiz uses American spelling, like the rest of this site. IUPAC itself writes aluminium and caesium, and sulphur is the older British spelling. All of them are accepted when you type, so nobody loses a point over the spelling their own class uses. The symbols Al, Cs and S are right answers too.

Who decides which elements are metalloids?

Nobody does officially. IUPAC names the elements and numbers the 18 groups, but it does not rule on which elements are metalloids. The families here follow PubChem, which lists seven: Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium and Polonium. Your textbook may draw the line elsewhere. Elements 113 to 118 are grouped by their column, because little is known of their chemistry.

Why do two rows sit below the table?

To keep the table narrow enough to read. Periods 6 and 7 hold 32 elements each, and a table 32 columns wide would not fit a page or a phone. So the 15 lanthanides and 15 actinides are set below, as on the IUPAC table, and the group 3 cells marked 57-71 and 89-103 show where they slot in.

Can I print a blank periodic table of elements quiz for class?

Yes. Print blank gives the empty table with the atomic numbers in the cells, a name and date line, and a numbered answer line for every element. Print labelled gives the same sheet with the names filled in. The quiz needs no account and nothing installed, so a class can run it on the board first.

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