Question

what do you mean isotopes?

Answer 1

Hey friend,
Here is the a dear you were looking for:

The same elements with same atomic number but different mass number are called isotopes. The change in the mass number is due to change in number of neutrons in that element

Hope this helps!!!

@Mahak24

Thanks...
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Answer 2

2 or more form of element that contain equal no . of proton and different no. of nutrone