# How do you use shorthand notation?

Dec 26, 2017

To use a noble gas in the electron configuration.

E.g. $\left[N e\right] 3 {s}^{1}$

#### Explanation:

It means to use noble gas configuration to shorten the electron configuration names.

We could use it for big elements like Uranium ($U$).

Uranium has an electron configuration of $1 {s}^{2} \setminus 2 {s}^{2} \setminus 2 {p}^{6} \setminus 3 {s}^{2} \setminus 3 {p}^{6} \setminus 4 {s}^{2} \setminus 3 {d}^{10} \setminus 4 {p}^{6} \setminus 5 {s}^{2} \setminus 4 {d}^{10} \setminus 5 {p}^{6} \setminus 6 {s}^{2} \setminus 4 {f}^{14} \setminus 5 {d}^{10} \setminus 6 {p}^{6} \setminus 7 {s}^{2} \setminus 5 {f}^{4}$.

We can write it with a noble gas, which shortens it immensely

From $1 {s}^{2} \setminus 2 {s}^{2} \setminus 2 {p}^{6} \setminus 3 {s}^{2} \setminus 3 {p}^{6} \setminus 4 {s}^{2} \setminus 3 {d}^{10} \setminus 4 {p}^{6} \setminus 5 {s}^{2} \setminus 4 {d}^{10} \setminus 5 {p}^{6} \setminus 6 {s}^{2} \setminus 4 {f}^{14} \setminus 5 {d}^{10} \setminus 6 {p}^{6} \setminus 7 {s}^{2} \setminus 5 {f}^{4}$,
we shorten it to just $\left[R n\right] 5 {f}^{3} \setminus 6 {d}^{1} \setminus 7 {s}^{2}$.

The trick is to use the closest noble gas to the element you are writing it with the e. configuration, and then continue with the pattern shown in this picture: