question_answer

The atomic number and mass number of an element x are 15 and 31respectively.

Element	No. of electrons	No. of electrons	No. of neutrons
(i)	15	15	16
(ii)	31	15	15
(iii)	31	31	15
(iv)	15	16	14

Which one of these represents X?

A) (i)                    

B) (ii)

C) (iii)                               

D) (iv)

E) None of these