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Secondary IV • 2yr.


I was wondering, is there a particular order in the periodic table? Because from left to right and from top to bottom the number in the box starts from 1 and goes up, but does this number mean something or is it a reference number that has been set randomly? Thanks for your time :))


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Explanations (1)

  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

    Team Alloprof • 2yr.


    The number you are referring to is the atomic number. This number represents the number of protons present in an atom.

    This number is characteristic of each atom; two different atoms cannot have the same number of protons!

    In the periodic table, atoms are classified according to their atomic number. The table starts with hydrogen, which has 1 proton, which is followed by helium which has 2 protons, and so on.

    Hope this may have enlightened your understanding! Don't hesitate to come back and ask questions 🙂

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