What is the similarity in chemical properties of the atoms of elements in a group of the periodic table is most closely related to?

Answer 1

Surely it is most closely related to the element's #"electronic structure?"#

Atoms from the same Group of the Periodic Table have the same number and symmetry of valence electrons, and this electronic similarity should give rise to similar chemistry.

And indeed it does.......

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Answer 2

Caleb Adams

The valence electron configuration of an element's atom is the most intimately linked factor in the chemical similarities amongst its constituents in a given group of the periodic table.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.