Chemistry / Chem 0273 · Atom · ~20 seconds
The Periodic Law
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Under the periodic law, elemental properties repeat at regular intervals when the elements are ordered by atomic number rather than atomic mass.
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Arranging elements by increasing atomic number places lithium, sodium, and potassium in one column, each showing similar reactive chemical behavior.
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Mendeleev's table used atomic mass; the later shift to atomic number resolved ordering problems the mass-based table could not fix.