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Question

From the reaction given below deduce the group of  polonium in the periodic table (Pb belongs to group 14).
$$_{84}Po^{210}\, \rightarrow\, _{82}Pb^{206}\, +\, _2He^4$$


A
2
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B
14
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C
6
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D
16
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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, $$Pb$$ belongs to group 14, $$Po$$ must belong to group 16.

Chemistry
NCERT
Standard XII

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