Which of the following elements belongs to 4n-series?

P b - 207

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B i - 209

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P b - 208

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P b - 206

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Solution

The correct option is C $P b - 208$
Pb-208 belongs to 4n-series. Also called thorium series, in 4n series, mass number divides completely by four.

$_{90}^{232} T h - 6 α - - \to - 4 β_{82}^{208} P b$

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