Question

Why are noble gases stable?

Answer 1

The Noble Gas elements are stable and unreactive (inert) because the outer valence shells are complete with eight electrons, `s^2 p^6`

Neon - Ne `1s^2 2s^2 2p^6`
Argon - Ar `1s^2 2s^2 2p^6 3s^2 3p^6`
Krypton - Kr `[Ar] 3d^10 4s^2 4p^6`

With the outer s and p orbitals filled and the rule of octet satisfied the Noble Gas elements do not seek to gain or lose electrons through the process of bonding.