Question

Most common inert gases are:

• A. Helium
• B. Krypton
• C. Argon
• D. All of above

Answer 1

The correct option is D All of above

When we refer to inert gases, we are usually referring to six primary ones, also called the noble gases. Meet the most common inert gases: helium $\left(He\right)$, argon $\left(Ar\right)$, neon $\left(Ne\right)$, krypton $\left(Kr\right)$, xenon $\left(Xe\right)$, and radon $\left(Rn\right)$.