In the present periodic table containing 118 elements: How many zero group elements exist?

• The zero group electrons have completely filled shells and have zero valencies. They don't usually react with any element and are thus called noble or inert gases.
• Six elements exist in the zero groups of the periodic table.
• Zero group elements are Helium $\left(\mathrm{He}\right)$, Neon $\left(\mathrm{Ne}\right)$, Argon $\left(\mathrm{Ar}\right)$, Krypton $\left(\mathrm{Kr}\right)$, Xenon $\left(\mathrm{Xe}\right)$, and Radon $\left(\mathrm{Rn}\right)$.