GENERAL KNOWLEDGE

Detailed explanation-1: -Neon (Ne), argon (Ar), and xenon (Xe) have filled outermost shells.

Detailed explanation-2: -Similarly, neon has a complete outer 2n shell containing eight electrons. These electron configurations make helium and neon very stable.

Detailed explanation-3: -Group 18 elements (helium, neon, and argon are shown) have a full outer, or valence, shell. A full valence shell is the most stable electron configuration. Elements in other groups have partially-filled valence shells and gain or lose electrons to achieve a stable electron configuration.

Detailed explanation-4: -It is non-reactive because it’s shells are full. Because neon has two atomic shells, it needs two electrons in the first and eight to fill the second. Neon has a total of ten electrons which means two filled shells.

Detailed explanation-5: -A full outer shell is known as the noble gas configuration where the outer shell of an atom is energetically stable and contains 8 outer electrons.