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Q.

The group number (in long form periodic table) radio active element which disintegrates to give two noble gases is ___

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answer is 2.

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Detailed Solution

$_{88} {Ra}^{226} {\to_{}^{}}_{86} {Rn}^{222} +_{2} {He}^{4}$

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The group number (in long form periodic table) radio active element which disintegrates to give two noble gases is ___