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1. which of the following is not a radio active element?
- A. uranium
- B. uranium
- C. uranium
- D. uranium
Answer: Option C
Explanation:
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.
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