An atom X has 4 protons and 5 neutrons with electronic configuration 2, 2.
Give information about its
(i) atomic number
(ii) mass number
(iii) valency
Number of protons of atom X = 4
Number of neutrons = 5
Electronic configuration = 2, 2
(i) Atomic number of atom X = 4
(ii) Mass number = 4 + 5 = 9
(iii) Valency = 2