Q22 of 149 Page 210

What is the reason for the different atomic masses of the isotopes of an element?

the reason for the different atomic masses of the isotopes of an element is, due to different number of neutrons in their nuclei.


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20

Give one use each of the following radioactive isotopes:

(a) Uranium-235


(b) Cobalt–60

 21

Explain why are not considered isotopes.

 23

What is the reason for the identical chemical properties of all the isotopes of an element? Explain with the help of an example.

 24

What is the reason for the slightly different physical properties of all the isotopes of an element?