# How do you determine whether a element is not isoelectronic with another element?

Dec 12, 2016

Look at the electron configuration for the element, and see if they have the same configuration.

#### Explanation:

For instance elemental carbon has an electron configuartion of:

$C = \left[H e\right] 2 {s}^{2} 2 {p}^{2}$

But if it gains four more electron...

$C = \left[H e\right] 2 {s}^{2} 2 {p}^{6}$ which is an identical electron configuration to $\left[N e\right]$

And then becomes isoelectronic to Neon. So then electronically a carbon atom which has gained four electron has a configuartion of:

$C = \left[N e\right]$