Can You Name?

Elements Classic · completed 13 Aug 2026 · top 10

22

22/118 elements named

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Matter in your table

Your recalled elements connect into familiar matter.

These are constituent-element matches, not instructions for mixing elements. Ratios, bonds, structure, and reaction conditions decide what matter actually forms.

  1. C₈H₁₀N₄O₂HCNO
    Element map · dotted links show shared membership, not chemical bonds

    Your table contains caffeine’s four elements.

    Every atom in caffeine is carbon, hydrogen, nitrogen, or oxygen. The subscripts show how many of each occur in one molecule.

    PubChem: caffeine

  2. HOH
    WaterH₂O
    HOOH
    Hydrogen peroxideH₂O₂

    Same elements. One extra oxygen. Very different matter.

    Water and hydrogen peroxide contain only hydrogen and oxygen, but their atom counts and O–O bonding differ. Element membership alone does not determine a substance.

    PubChem: water · hydrogen peroxide

  3. CaCO₃COCa
    Element map · dotted links show shared membership, not chemical bonds

    Calcium, carbon, and oxygen put limestone on your map.

    Calcium carbonate is the principal chemical constituent of limestone and has the formula CaCO₃.

    PubChem: calcium carbonate

One element away

Magnesium would complete the element set for C₅₅H₇₂MgN₄O₅.

Mg

All 22 elements named

Your complete run in recall order.

  1. H1

    Hydrogen

    #1 recalled

  2. O8

    Oxygen

    #2 recalled

  3. Li3

    Lithium

    #3 recalled

  4. Au79

    Gold

    #4 recalled

  5. Pt78

    Platinum

    #5 recalled

  6. Si14

    Silicon

    #6 recalled

  7. C6

    Carbon

    #7 recalled

  8. K19

    Potassium

    #8 recalled

  9. Xe54

    Xenon

    #9 recalled

  10. Cu29

    Copper

    #10 recalled

  11. Sn50

    Tin

    #11 recalled

  12. Al13

    Aluminum

    #12 recalled

  13. N7

    Nitrogen

    #13 recalled

  14. He2

    Helium

    #14 recalled

  15. Ca20

    Calcium

    #15 recalled

  16. Ra88

    Radium

    #16 recalled

  17. In49

    Indium

    #17 recalled

  18. Pu94

    Plutonium

    #18 recalled

  19. Ag47

    Silver

    #19 recalled

  20. W74

    Tungsten

    #20 recalled

  21. Co27

    Cobalt

    #21 recalled

  22. U92

    Uranium

    #22 recalled

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