# What is an excited state of scandium?

##### 1 Answer

Well, the **ground-state** electron configuration of

#[Ar] 3d^1 4s^2#

*a valence electron is promoted to a clearly higher energy level*.

We'll assume the **excited states** as:

#[Ar] 3d^1 4s^color(red)(2) -> barul(|stackrel(" ")(" "[Ar] 3d^1 4s^1 4p^color(red)(1)" ")|)# (There are other lower-lying states, but we are ignoring them for simplicity.)

Due to spin-orbit coupling...

(Notice how the

#""^3# states have three energy levels.)

...the destination state (a **four** energy levels of this *same* configuration, with term symbols

Assuming we start at the ground-state energy level of **any of the following frequencies**:

#"15 672.58 cm"^(-1)#

#"15 756.57 cm"^(-1)#

#"15 881.75 cm"^(-1)#

#"16 026.62 cm"^(-1)#