Question

State why noble gases are unreactive while atoms of elements other than noble gas are chemically reactive.

Answer 1

Hint: The noble gases are a group of chemical elements with comparable characteristics; they are all odourless, colourless, monatomic gases with very little chemical reactivity under normal conditions. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radioactive radon are the six naturally occurring noble gases (Rn).

Complete Step By Step Answer:
The least reactive of all known elements are noble gases. Because they each have eight valence electrons, their outer energy levels are filled. Helium is the sole exception, as it only possesses two electrons. Because it's lone energy level (energy level 1) can only carry two electrons, helium has a complete outer energy level. The most stable arrangement of electrons is a complete outer energy level. As a result, noble gases cannot become more stable by acquiring or losing valence electrons via interacting with other elements. As a result, noble gases are rarely used in chemical processes and nearly never combine with other elements to create compounds.
The noble gases' eight valence electrons are used as a standard for non-reactivity and to illustrate how other elements interact since they are the least reactive of all elements. The octet ("group of eight") rule is used to express this. According to this law, atoms react to produce compounds with an eight-valence electron group, similar to noble gases. For instance, sodium (one valence electron) combines with chlorine (seven valence electrons) to produce sodium chloride, a stable molecule (table salt). Sodium contributes an electron and chlorine receives it in this process, giving each element an octet of valence electrons.
Hence noble gases are unreactive in nature.

Note:
Noble gases are the most stable because they can store the most valence electrons in their outer shell. As a result of their stability, they seldom react with other elements. Noble gases also conduct electricity, glow, are odourless and colourless, and are employed in a variety of situations where a stable element is required to ensure a safe and consistent atmosphere. Helium, neon, argon, krypton, xenon, and radon are all members of this chemical family. Previously, noble gases were referred to as inert gases, but this phrase is no longer true because some of them participate in chemical processes.