Question

which is correct?

X: Isotopes are atoms with the same atomic number but different number of electrons.

Y: Isotopes are atoms with the same atomic number but different number of protons.

Answer 1

Answer:

I thnk x is the answer.

Explanation:

Answer 2

Answer:

none of the options is correct..

the electrons /protons of isotopes are same in no. (atomic no.) but neutrons are different in no. which makes a difference in mass