Question

Two isotopes of gallium occur naturally, ${}_{31}{}^{69}Ga$ and ${}_{31}{}^{71}Ga$. Which isotope of gallium is more abundant?

Short answer

The isotope of gallium which is more abundant is ${}_{31}{}^{69}Ga$

Step-by-step solution

Given information 

We need to find that out of ${}_{31}{}^{69}Ga$and ${}_{31}{}^{71}Ga$ which is more abundant.

Explanation 

The atomic mass of an element on the periodic table is used to find the most abundant isotope. Gallium has an atomic weight of $69.723amu$, as can be shown. Although no gallium atom has that mass, it is the average mass of a gallium sample.

When comparing the atomic masses of ${}_{31}{}^{69}Ga$and ${}_{31}{}^{71}Ga$, we can see that the atomic mass number on the periodic table is closer to that of ${}_{31}{}^{69}Ga$.

We can deduce that ${}_{31}{}^{69}Ga$is more plentiful.