Q21 of 149 Page 210

Explain why are not considered isotopes.

are not considered isotopes because they do not have same atomic number.


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19

What valencies will be shown by the elements A, B, C, D and E having atomic numbers 2, 4, 8, 10, and 13 respectively.

 20

Give one use each of the following radioactive isotopes:

(a) Uranium-235


(b) Cobalt–60

 22

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

 23

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