# What is a noble gas?

Apr 30, 2014

The Noble Gas elements are founding the last column on the right of the periodic tale, column 18 (VIIIA). The elements include Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn).

Each of these elements have completed s and p orbitals of the highest eery level, ${s}^{2} {p}^{6}$. These elements all complete the Rule of Octet (Helium - Rule of Duet).

Helium - He $1 {s}^{2}$
Neon - Ne $1 {s}^{2} 2 {s}^{2} 2 {p}^{6}$
Argon - Ar $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6}$
Krypton - Kr $\left[A r\right] 3 {d}^{10} 4 {s}^{2} 4 {p}^{6}$
Xenon - Xe $\left[K r\right] 4 {d}^{10} 5 {s}^{2} 5 {p}^{6}$
Radon - Rn $\left[X e\right] 5 {d}^{10} 6 {s}^{2} 6 {p}^{6}$

Since each of these elements have completed outer valence shells they do not seek to lose or gain electrons to become stable. These elements therefore do not readily bond with other elements and therefore are considered inert or unreactive.