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Alpha Decay

An atom with ...

Question

An atom with mass number $A_{1}$ converts into atom with mass number $A_{2}$ after radioactive decay. The correct statement is

A_{2}

can never be equal to

A_{1}

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the value of

A_{1}

will be less than

A_{2}

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the value of

A_{2}

will not be more than that of

A_{1}

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the value of

A_{1}

will not be more than that of

A_{2}

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Solution

The correct option is C the value of $A_{2}$ will not be more than that of $A_{1}$
Alpha decay : $_{Z}^{A_{1}} X \to_{Z - 2}^{A_{1} - 4} Y +_{2}^{4} H e$ i.e. $A_{2} = A_{1} - 4$

Beta decay : $_{Z}^{A_{1}} X \to_{Z + 1}^{A_{1}} Y +_{- 1}^{0} e$ i.e. $A_{2} = A_{1}$

Gamma decay : $_{Z}^{A_{1}} X \to_{Z}^{A_{1}} X + γ$ i.e. $A_{2} = A_{1}$

$⟹$ $A_{2} \leq A_{1}$

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An atom with mass number A1 converts into atom with mass number A2 after radioactive decay. The correct statement is

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