An isotope with 22 neutrons and 18 protons is what?
A) ${ }_{18}^{42} \mathrm{Ar}$
B) ${ }_{18}^{22} \mathrm{Ar}$
C) ${ }_{18}^{40} \mathrm{Ar}$
D) ${ }_{22}^{18} \mathrm{Ar}$

Question

Quizplus · Accepted Answer

The atomic number (number of protons) for Argon (Ar) is 18. The mass number is the sum of protons and neutrons, which is 18 + 22 = 40, making the correct isotope ${ }_{18}^{40} \mathrm{Ar}$.

An Isotope with 22 Neutrons and 18 Protons Is What 1842Ar{ }_{18}^{42} \mathrm{Ar}1842​Ar

An Isotope with 22 Neutrons and 18 Protons Is What ${ }_{18}^{42} \mathrm{Ar}$