A ${}^{213}_{\ \ 84}{\mathrm{Po}}$ mag $\alpha $-bomlással átalakul. Milyen elem keletkezik?
A) ${}^{209}_{\ \ 82}{\mathrm{Pb}}$
B) ${}^{213}_{\ \ 83}{\mathrm{Bi}}$
C) ${}^{209}_{\ \ 83}{\mathrm{Bi}}$
A) ${}^{209}_{\ \ 82}{\mathrm{Pb}}$
B) ${}^{213}_{\ \ 83}{\mathrm{Bi}}$
C) ${}^{209}_{\ \ 83}{\mathrm{Bi}}$