# What are some examples of noble gas shorthands?

Apr 30, 2014

Noble Gas notation, also known as core notation is a shortened version of the format for electron configurations using the noble gas to represent the completed orbitals of the atoms structure.
Here a three examples using Iodine (I), Germanium (Ge) and Zirconium (Zr).

Iodine (I) would have a standard electron configuration of

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{4} {s}^{2} 3 {d}^{10} 4 {p}^{6} 5 {s}^{2} 4 {d}^{10} 5 {p}^{5}$

The noble gas in the row above iodine is kryton

We can replace $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{10} 4 {p}^{6}$ with the symbol [Kr] and rewrite the noble gas configuration of iodine as

$\left[K r\right] 5 {s}^{5} {d}^{10} 5 {p}^{5}$

Germanium (Ge) is located in the 4th energy level (row) of the periodic table, column 14 (IVA). This position would be an electron configuration of

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{10} 4 {p}^{2}$

To convert this to the Noble Gas notation we revert back to the Noble Gas from period 3 of the periodic table Argon

Argon - Ar $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6}$

We then replace this section of Germanium's electron configuration with [Ar].

$\left[A r\right] 4 {s}^{2} 3 {d}^{10} 4 {p}^{2}$

Zirconium (Zr) is located in the 5th energy level (row) of the periodic table, column 4 (IVB). This position would be an electron configuration of

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{10} 4 {p}^{6} 5 {s}^{2} 4 {d}^{2}$

To convert this to the Noble Gas notation we revert back to the Noble Gas from period 4 of the periodic table Krypton

Krypton - Kr $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{10} 4 {p}^{6}$

We then replace this section of Zirconium's electron configuration with [Kr].

$\left[K r\right] 4 {s}^{2} 3 {d}^{2}$