Given the following electronic configurations, identify how many valence electrons each atom has. a = b = c = identifying valence electrons

A= 1

B= 6

C= 8

This is the correct answer on Edg.

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell