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 $2$ and the mass number will drop by 4.

If $""_Z^AX$ be the parent nucleus and $Y$ be the daughter nucleus, then nuclear equation of emission of alpha particle will be:

$""_Z^AX -> ""_2^4He + ""_(Z-2)^(A-4)Y$

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?