When undergoes alpha decay,the daughter is ${ } _ { 88 } ^ { 226 } \mathrm { Ra }$

Question

Quizplus · Accepted Answer

When an alpha particle is emitted during alpha decay, the mass number decreases by 4 and the atomic number decreases by 2. Starting with ${ } _{88}^{226}\mathrm{Ra}$, the daughter nucleus must have an atomic number 2 less, which eliminates choices B, C, and D. The daughter nucleus must also have a mass number 4 less than 226, which is ${ }_{86}^{222}\mathrm{Rn}$, the correct answer.

When Undergoes Alpha Decay,the Daughter Is 88226Ra{ } _ { 88 } ^ { 226 } \mathrm { Ra }88226​Ra

When Undergoes Alpha Decay,the Daughter Is ${ } _ { 88 } ^ { 226 } \mathrm { Ra }$