Q20 of 149 Page 210

Give one use each of the following radioactive isotopes:

(a) Uranium-235


(b) Cobalt–60

(a) As a fuel in the reactors of nuclear power plants for generating electricity we use Uranium-235.

(b) for the treatment of cancer we use Cobalt–60.


More from this chapter

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18

The atomic number of an element X is 16.

(a) Write down the electronic configuration of X.


(b) What will be the valency of X?

 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.

 21

Explain why are not considered isotopes.

 22

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