Those elements, with an electronic configuration of valence shell ns2 np6 show little tendency to react chemically, are called?

Explanation

The reactivity of lanthanides is generally lower than that of the corresponding alkali and alkaline earth metals. Lanthanides are relatively unreactive with water and oxygen, and they do not readily dissolve in most acids. However, they can react with strong oxidizing agents, such as chlorine or fluorine, to form a variety of compounds. Actinides are highly reactive elements due to their large atomic and ionic radii, high charge densities, and the presence of f-orbitals, which make them more susceptible to oxidation and reduction reactions. The alkali metals are highly reactive metals, and their reactivity increases from top to bottom of the group. Noble metals include metals such as gold, silver, platinum, and palladium. These metals are characterized by their low chemical reactivity, which is due to the fact that they have a completely filled outermost electron shell.