Bismuth $^{212}_{83}$ Bi Is Known to Be Radioactive $\^{212} _{83}$

Bismuth $^{212}_{83}$ Bi is known to be radioactive. The stability of $\^{212} _{83}$ Bi with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known: $^{4}_{2}$ He: 4.002603 u $^{208} _{81}$ Tl: 207.981998 u $^{212} _{82}$ Pb: 211.991871 u $^{212}_{83}$ Bi: 211.991255 u $^{212}_{84} Po$ : 211.988842 u The $^{212}_{83} Bi$ nucleus is

A) subject to alpha decay only.
B) subject to beta-plus decay only.
C) subject to beta-minus decay only.
D) subject to alpha or beta-plus decay, but not beta-minus decay.
E) subject to alpha or beta-minus decay, but not beta-plus decay.

Correct Answer:

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