What is the deal with Argon? The electron config?

Question

The electron configuration is

1s^2, 2s^2, 2p^6, 3s^2, 3p^6

is that correct
what is it for K?

Answer 1

Electron Configurations:

Argon (Ar) - 1s^2 2s^2 2p^6 3s^2 3p^6.
Potassium (K) - 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1

Noble Gas Configurations:

Argon (Ar) - [Ne] 3s^2 3p^6.
Potassium (K) - [Ar] 4s^1

Answer 2

yep
K = 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^1 ....

Ar has full shells and is innert
K has a spare Electron in it's outter shell making it Negative charged

Answer 3

that looks correct to me. For K: it's the same as above, plus 4s^1
so, 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^1