Assertion :When there is an emission of $α$ -particles, new elements is displaced two group of the parent element. Reason: Atomic mass decreases by 2 units due to $α$ -particle emission.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
When there is an emission of -particles, new elements is displaced two group of the parent element, as the atomic number decreases by 2 units.
$_{Z} X^{A} \to_{Z - 2} Y^{A - 4} +_{2} H e^{4}$
The mass number decreases by 4 units.
Thus, Assertion is correct but Reason is incorrect

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