question_answer

Actinium 231,\[^{231}A{{C}_{89}}\], emit in succession two \[\beta \] particles, four \[\alpha \]-particles, one \[\beta \] and one \[\alpha \] plus several \[\gamma \] rays. What is the resultant isotope?

A)  \[^{221}A{{u}_{79}}\]

B)  \[^{221}P{{b}_{82}}\]

C)  \[^{211}A{{u}_{79}}\]

D)  \[^{211}P{{b}_{82}}\]