You're likely asking about the electron configuration of chlorine, which has the chemical symbol Cl, not CI.

Here's the electron configuration of chlorine:

1s² 2s² 2p⁶ 3s² 3p⁵

Here's a breakdown:

* 1s²: The first energy level (n=1) has two electrons in the s orbital.

* 2s²: The second energy level (n=2) has two electrons in the s orbital.

* 2p⁶: The second energy level (n=2) has six electrons in the p orbital.

* 3s²: The third energy level (n=3) has two electrons in the s orbital.

* 3p⁵: The third energy level (n=3) has five electrons in the p orbital.

You can also represent this using the noble gas shorthand:

[Ne] 3s² 3p⁵

This indicates that chlorine has the same inner electron configuration as neon (1s² 2s² 2p⁶) and then adds the remaining electrons in the third energy level.