Find out the valency of the atoms represented by the Figure (a) and (b).
Answer:
Atom (a) has zero valency since it has 8 electrons in the valence shell and has achieved a stable configuration. Atom (b) has a valency of 1 since it has 7 electrons in the valence shell. Atom (b) can accept on more electron in order to achieve a stable (octet) configuration.