Question

A, B, C are three elements in which B is an inert gas other than helium.With this information complete the following table.

Element	Atomic number	No. of electrons in the valence shell	Group to which the element belongs
A	Z - 1
B	Z
C	Z + 1

Also, explain the following : Electron affinity of B is Zero.

Answer 1

Element	Atomic number	No. of electrons in the valence shell	Group to which the element belongs
A	Z - 1
B	Z
C	Z + 1	1	1

Since B is a noble gas element so its electron affinity is zero as its octet is complete.