Q.

Which of the following is an artificial man-made series?

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a

Thorium series

b

Neptunium series

c

Uranium series

d

Actinium series

answer is B.

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Detailed Solution

.The neptunium series is a radioactive series beginning with neptunium-237. Its members are produced artificially by nuclear reactions and do not occur naturally, because the half-life of the longest lived isotope in the series is short compared to the age of the earth
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