# How can you tell the electron configuration from the periodic table?

Dec 28, 2017

By a lot of practice, and a good understanding of this diagram,

For instance oxygen has a configuration (per that table above) of,

$1 {s}^{2} 2 {s}^{2} 2 {p}^{4}$

and uranium,

$\left[R n\right] 5 {f}^{3} 6 {d}^{1} 7 {s}^{2}$

The element in brackets is shorthand for all of the electron configuration it has, since uranium is beyond it in the periodic table.