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The number of protons, neutrons and elec...

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.

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The correct Answer is:
A and D ; Same number of protons but different number of neutrons
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