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Atomic number dictates repeating chemical patterns across periods and groups. The figure is taken from Nobel Prize, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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The periodic table organizes elements by proton count

Atomic number dictates repeating chemical patterns across periods and groups

Dmitri Mendeleev created the first periodic table by grouping chemical elements according to recurring traits. Modern periodic tables arrange elements sequentially by atomic number, which represents the exact count of protons in an atom's nucleus. Elements sharing vertical columns possess matching valence electron counts and similar chemical reactivity.

Where this comes from

Nobel Prize

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Tags: chemistry, periodic table, elements

The periodic table organizes elements by proton count: the short answers

Where does this come from, and can I check it?: Atomic number dictates repeating chemical patterns across periods and groups. The figure is taken from Nobel Prize, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a science fact?: Yes. It sits on the Science shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.