A nucleus $X presubscript straight n presuperscript straight m$ emits one α - particle and two β^- particles. The resulting nucleus is

$straight Z presubscript straight n presuperscript straight m minus 6 end presuperscript$
$straight X presubscript straight n presuperscript straight m minus 4 end presuperscript space space$
$straight Y presubscript straight n minus 2 end presubscript presuperscript straight m minus 4 end presuperscript$
$straight Z presubscript straight n minus 4 end presubscript presuperscript straight m minus 6 end presuperscript$

Solution

straight X presubscript straight n presuperscript straight m minus 4 end presuperscript space space

straight X presubscript straight n presuperscript straight m space rightwards arrow with straight alpha on top space straight X presubscript straight n minus 2 end presubscript superscript straight m minus 4 end superscript space rightwards arrow with 2 straight beta on top space straight X presubscript straight n superscript straight m minus 4 end superscript

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