An atom with 3 protons and 4 neutrons will have a valency of (a) 3 (b) 7 (c) 1 …
3 protons = 3 electrons
The electronic configuration is 2, 1
Hence, the valency is 1. Therefore option (c) is correct.
(c) Given that, number of protons in an atom = 3 and number of neutrons = 4
Electronic configuration of 3Li = 2, 1
As, it has one valence electron, therefore its valency is also 1.
Protons Is equal to the number of electrons…Electronic configuration is 2,1….Hence the valency is -1…..Answer is (c)..