The last member of 4n + 1 series is an isotope of:

thalium

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antimony

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bismuth

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indium

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Solution

The correct option is D bismuth
The last member of 4n + 1 series is an isotope of Bi
4n+1 series is neptunium series. It is an artificial series.
$_{94} P u^{241} \to_{83} B i^{209}$

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