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A radioactive element X disintegrates su...

A radioactive element X disintegrates successively as under

If atomic number and atomic mass number of X arc respectively 72 and 180. what are the corresponding values for `X_(4)`

A

`172, 70`

B

`171, 69`

C

`172, 69`

D

`172, 68`

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The correct Answer is:
B
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