Question

Question 14
An atom with 3 protons and 4 neutrons will have a valency of

(a) 3
(b) 7
(c) 1
(d) 4

Answer 1

The answer is (c).
Given that, number of protons in an atom = 3 and number of neutrons = 4
Electronic configuration of ${}_{3}Li=2,1$
As it has one valence electron. therefore its valency is also 1.