Question

Elements that have complete valence electron shells are mostly found in the

Answer 1

noble gases have complete valence electron shells

Answer 2

Step-by-step explanation:

Elements of group 18 are known as noble gases. The elements of this group are He, Ne, Ar, Kr, Xe, and Rn.

The electronic configuration of He is
`1s^(2)`.

The electronic configuration of Ne is
`1s^(2)2s^(2)2p^(6)`.

The electronic configuration of Ar is
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)`.

The electronic configuration of Kr is
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)`.

The electronic configuration of Xe is
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)4d^(10)5s^(2)5p^(6)`

The electronic configuration of Rn is
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)4d^(10)5s^(2)5p^(6)4f^(14)5d^(10)6s^(2)6p^(6)`.

Thus, we can conclude that elements of group 18 have complete valence electron shells.