# Look at the following diagram and write below the correct electronic configuration to indicate the electronics in the s, p and d orbitals?

Jul 10, 2017

Well, from the diagram, the electron shells, using so-called "KLMN notation" (or X-ray notation), have the configuration

$2 , 8 , 8 , 1$.

Whatever that means in what I consider a more informative notation (which delineates the subshells), we'll have to translate...

Orbital notation, or "SPDF" notation, differentiates between the orbital subshells as follows, grouping them by principal quantum number $n$.

It compares with X-ray notation as follows.

${\overbrace{1 s}}^{K} , {\overbrace{2 s , 2 p}}^{L} , {\overbrace{3 s , 3 p , 3 d}}^{M} , {\overbrace{4 s , 4 p , 4 d , 4 f}}^{N}$

So, the configuration really indicates:

${\overbrace{1 {s}^{2}}}^{2} {\overbrace{2 {s}^{2} 2 {p}^{6}}}^{8} {\overbrace{3 {s}^{2} 3 {p}^{6} 3 {d}^{0}}}^{8} {\overbrace{4 {s}^{1} 4 {p}^{0} 4 {d}^{0} 4 {f}^{0}}}^{1}$,

or more simply,

$\textcolor{b l u e}{1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{1}}$,

the configuration for potassium.