Question

Question 5 (b)
An atom has electronic configuration 2, 8, 7.
To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses).

N (7), F (9), P (15), Ar(18).

Answer 1

Elements present in same group have similar chemical properties. Elements having same valence are placed in same group. So, the given element will be chemically similar to F (9) which has electronic configuration 2, 7.