Question 1
The stability of
Cl with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:
 He: | 4.002603 u |
 P: | 31.973907 u |
 S: | 35.967081 u |
| Cl: | 35.968307 u |
 Ar: | 35.967546 u |
The
Cl nucleus is
◦ subject to alpha decay only.
◦ not subject to alpha, beta-plus or beta-minus decay.
◦ subject to beta-plus decay only.
◦ subject to beta-plus or beta-minus decay, but not to alpha decay.
◦ subject to beta-minus decay only.
Question 2
Bismuth
Bi is known to be radioactive. The stability of
Bi with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:
| He: | 4.002603 u |
 Tl: | 207.981998 u |
 Pb: | 211.991871 u |
| Bi: | 211.991255 u |
 Po: | 211.988842 u |
The
Bi nucleus is
◦ subject to beta-minus decay only.
◦ subject to beta-plus decay only.
◦ subject to alpha or beta-minus decay, but not beta-plus decay.
◦ subject to alpha decay only.
◦ subject to alpha or beta-plus decay, but not beta-minus decay.
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