What Isotope Has 2 Neutrons and 2 Protons?
A) ${ }_{4}^{2} \mathrm{Be}$

Multiple Choice

What isotope has 2 neutrons and 2 protons?

A) ${ }_{4}^{2} \mathrm{Be}$
B) ${ }_{2}^{4} \mathrm{Be}$
C) ${ }_{4}^{2} \mathrm{He}$
D) ${ }_{2}^{4} \mathrm{He}$