Question

In which group of elements do most atoms have completely filled s and p valence sublevels?

Answer 1

Group 8A or Noble Gases

Answer 2

Noble or inert gases belong to the group 8A and have completely filled stable, outermost shells. The outermost electronic configuration of the noble gases can be represented as,

1. Helium -
`1s^(2)`

2. Neon -
`[He]2s^(2)2p^(6)`

3. Argon -
`[Ne]3s^(2)3p^(6)`

4. Krypton -
`[Ar] 3d^(10)4s^(2)4p^(6)`

5. Xenon -
`[Kr] 5d^(10)6s^(2)6p^(6)`

6. Radon -
`[Xe] 4f^(14) 5d^(10)6s^(2)6p^(6)`

So, the correct answer will be noble gases.