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Question

Which of the following nuclides belong to actinium (U235) series ?

A
Pb207
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B
Po215
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C
Po213
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D
1H3
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Solution

The correct options are
A Pb207
B Po215
Pb207 and Po215 belong to actinium (U235) series.

Actinium series is 4n+3 series. Here remainder is three when the mass number is divided by four.

This series involves emission of 7 alpha and 4 beta particles.

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