Question

What is the electron configuration for Astatine using noble gas shorthand notation?

Answer 1

Astatine - As, on the periodic table is found in the fifteenth column of the periodic table Group VA this is the third column of the p block. Astatine is in the fourth energy level (row).

This means that Astatine must end with an electron configuration of `4p^3`
The total electron configuration would be
`1s^2 2s^2 2P^6 3s^2 3p^6 4s^2 3d^10 4p^3`

The noble gas Argon has an electron configuration of
`1s^2 2s^2 2P^6 3s^2 3p^6`

So we can replace this portion of Astatine's electron configuration with the noble gas notation [Ar]

This makes the electron configuration for Astatine - As
`[Ar] 4s^2 3d^10 4p^3`

I hope this was helpful.
SMARTERTEACHER