When an element has Z=31 and 39 neutrons, what element and isotope is it?
A) ${ }_{70}^{31} \mathrm{Ga}$
B) ${ }_{70}^{31} \mathrm{Yb}$
C) ${ }_{31}^{70} \mathrm{Ga}$
D) ${ }_{31}^{70} \mathrm{Yb}$

Question

Quizplus · Accepted Answer

The element with atomic number (Z) 31 is Gallium (Ga), and with 39 neutrons, its mass number (A) is Z + N = 31 + 39 = 70, making it ${ }_{31}^{70} \mathrm{Ga}$.

When an Element Has Z=31 and 39 Neutrons, What Element 7031Ga{ }_{70}^{31} \mathrm{Ga}7031​Ga

When an Element Has Z=31 and 39 Neutrons, What Element ${ }_{70}^{31} \mathrm{Ga}$