Question

Which one of the following is not a radioactive element?; 1) Uranium; 2) Radium; 3) Thorium; 4) Cadmium

Answer 1

Here is your answer....
Cadmium

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Answer 2

Answer:

The correct answer of this question is option 4, cadmium.

Explanation:

Most of the radioactive materials belong to the 6th,7th and actinide periods of the modern periodic table.

But the cadmium metal belongs to the 4th period of the modern periodic table.

That's why cadmium is not a radioactive chemical compound and the correct answer of this question is option 4.