Question

Two neutral atoms X and Y have the same number of electrons but X is heavier than Y.
a) What is the relation between X and Y?
b) Number of which subatomic particle differs between X and Y?
c) If X is deuterium then what will be Y?

Answer 1

a) X and Y are Isotopes.

b) X has more no. of neutrons.

c) Y is Protium