Question

Question #11022

Answer 1

The Periodic Table “Groups” are defined by the valence electrons.

Explanation:

Chemical properties are the result of the interactions between valence electrons of different atoms. In terms of discovery, first the similarities of chemical reaction were observed.

Later, those reactions were related to the electronic configurations of the atoms. Finally, it was recognized that elements with similar electronic configurations reacted similarly.

The Periodic Table is the chart of how those elements are arranged according to their electronic configurations.
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