Isotopes

Isotopes are atoms of the same element, with the same atomic numbers but different mass numbers .

Why do isotopes occur ?

This is due to the difference in the number of neutrons in the nucleus of these atoms .

Chlorine atoms have the same atomic number 17 ( written as a subscript) but different mass number ( written as a superscript) .

Carbon has two isotopes, Carbon -12 and Carbon – 14 .

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