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Physics
Physics
Problem
A
88
226
Ra
^{226}_{88}\text{Ra}
88
226
Ra
nucleus undergoes an
α
\alpha
α
-decay followed immediately by two successive
β
−
\beta^{-}
β
−
-decays. Which nucleus is finally obtained? a)
88
224
R
a
^{224}_{88}\mathrm{Ra}
88
224
Ra
b)
86
222
R
n
^{222}_{86}\mathrm{Rn}
86
222
Rn
c)
88
222
R
a
^{222}_{88}\mathrm{Ra}
88
222
Ra
d)
87
222
F
r
^{222}_{87}\mathrm{Fr}
87
222
Fr
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