Question

Properties of the elements are given below. Where would you locate the following elements in the periodic table?

An element which is an inert gas with atomic number 2

Answer 1

An element which is an inert gas with atomic number 2:

• Inert element has a completely filled valence shell and thus it won't form bonds with other atoms.
• The inert elements are chemically unreactive.
• The element with the atomic number 2 is helium.
• The electronic configuration of helium is $1{\mathrm{s}}^2$
• Helium is the first-period element and belongs to the inert gas family (group 18).

Therefore, helium is an inert gas with atomic number 2 and is located in the first period and 18th group.