It an atom emits an alpha particle the atomic number of that will _ by 2 and the mass number will drop by Explain why this happens?

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Answer 1 · 2018-02-26T09:55:49

Atomic Number will decrease ** by $2$ $2$ and the mass number will drop by 4**.

If $_{Z}^{A} X$ $""_Z^AX$ be the parent nucleus and $Y$ $Y$ be the daughter nucleus, then nuclear equation of emission of alpha particle will be:

$_{Z}^{A} X \to_{2}^{4} H e +_{Z - 2}^{A - 4} Y$ $""_Z^AX -> ""_2^4He + ""_(Z-2)^(A-4)Y$

It an atom emits an alpha particle the atomic number of that will ___ by 2 and the mass number will drop by __ Explain why this happens?