Question

what is the common feature of electronic configuration of elements at the end of period 2 and period 3

Answer 1

The atoms of the elements at the end of Period 2 and Period 3 has 8 electrons in their outermost shell.

Answer 2

Answer:

the last elements of period 2 and period 3 are neon and argon.there are 8 valence electron in this element and hence has fully filled electronic configuration and is a stable element.

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