VIP|Valence Electrons|Inertness Of Noble Gas

Both helium (He) and magnesium (Mg) have two valence electrons. He represents a noble gas element, but Mg does not. Assign reason.

The number of valence electrons present in noble gases is:

Most of the monatomic ions of the representative elements are obtained by removing all the valence electrons from the atoms of metallic elements. Once these atoms have lost their valence electrons, they have stable noble gas or pseudo noble gas configurations. Which of these elements forms a cation having pseudo noble gas configuration?

The electron gain enthalpy of noble gas is

Both helium (He) and beryllium (Be) have two valence electrons.Whereas he represent a noble gas element,Be does no. Assign reason.

The valence shell configuration of noble gases (except He) is