From the reaction given below deduce the group of polonium in the periodic table (Pb belongs to group 14).
$_{84} P o^{210} \to_{82} P b^{206} +_{2} H e^{4}$

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Solution

The correct option is D 16
Fajan, Russel and Soddy (1913) gave group displacement law which states that on the emission of an $\alpha$ -particle the new element lies two columns left in the periodic table and mass number decreases by 4 units. Since, $P b$ belongs to group 14, $P o$ must belong to group 16.

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_{84}^{210} P o ⟶

_{82}^{206} P b +_{2}^{4} H e

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An element which is an essential constituent of all organic compounds belongs to the following group of the modern periodic table :

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