2. Tick the most appropriate answer.
(ii) The number of radioactive elements are:

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Solution

The correct option is C
36

Explanation:
(C)
There are 36 radioactive elements in the universe
Some elements of atomic nuclei are unstable because of the presence of excess nuclear charge inside it so these nuclei undergo radioactive decay to form stable nuclei. These elements are called radioactive elements.
They are either completely artificial, as all artificial elements lack stable isotopes, or they have no stable isotopes.
The common 4 radioactive elements are Uranium, Radium, Polonium, Thorium, etc.
Conclusion: Thus, option (C) is the correct answer.

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