Question 18
The $R-2$ is the hallmark of an alpha decay and an alpha particle has four nucleons. In the second decay, the number of nucleons remains the same so this is a beta decay.
$P=N-4$
In beta decay, the number of protons increases by 1.
$Q=R-2+1=R-1$
The $R-2$ is the hallmark of an alpha decay and an alpha particle has four nucleons. In the second decay, the number of nucleons remains the same so this is a beta decay.
$P=N-4$
In beta decay, the number of protons increases by 1.
$Q=R-2+1=R-1$