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Uses of Radioactivity

Nearly all is...

Question

Nearly all isotopes of elements having mass number _______ are radioactive.

A

Lower than 82

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B

Higher than 82

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C

Higher than 69

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D

Lower than 69

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Solution

The correct option is A Higher than 82
The isotopes of nearly all the elements of atomic number higher than 82 (i.e. lead) are radioactive. There are called the natural radioactive substances.

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