The valence shell electronic configuration of group 18 elements is ns2 np6. Members of group 18 have eight valence electrons, i.e., they have eight electrons in their outermost orbit (except helium). Thus, they exhibit a stable octet configuration. But helium exhibits a duplet configuration. The general configuration of the noble gas family is given as ns2np6 (except helium which has 1s2).
List of noble gases
Members of group 18 in the modern periodic table are known as the noble gases. They are:
- Helium (He)
- Neon (Ne)
- Argon (Ar)
- Krypton (Kr)
- Xenon (Xe)
- Radon (Rn)
