Question

Which is the necessary and sufficient condition for an element to be naturally radioactive?choose the correct option from the given options.
(A) Z>50
(B) Z>60
(C) Z>70
(D) Z>83

Answer 1

(D) Z>83 is the correct answer.

Natural radiation mainly comprises of the cosmic radiation. Radiation arising from decay of naturally that mainly occurs with the radio nuclides.

Natural radionuclides have the primordial radioactive elements hat is present in earth's crust so that it has many number of Cosmogenic radionuclides produced continuously with bombardment of stable nuclides.

Answer 2

Answer: D) Z>83

Explanation: All elements after atomic number 83 are naturally radioactive

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