Question

An atom contains 3 protons, 3 electrons, and 4 neutrons. What is it's atomic number, mass number and valency ?

Answer 1

Answer:

Atomic number = Number of protons = 3 Mass number = Number of protons + number of neutrons = 3 + 4 = 7 Electronic configuration of the atom is 2,1(K, L) Hence, its valency is 1.