Question

The number of protons, neutrons and electrons in particles A to E are given below :

Particle	Protons	Neutrons	Electrons
A	17	18	17
B	3	4	2
C	18	22	18
D	17	20	17
E	9	10	10

Giving reasons, find a pair of isotopes from the above particles.

Answer 1

Here, A and D are isotopes as they have the same number of protons but different number of neutrons.