1. Neutral Chlorine (Cl)
* Chlorine has an atomic number of 17, meaning it has 17 protons and 17 electrons.
* The electron configuration for neutral chlorine is: 1s² 2s² 2p⁶ 3s² 3p⁵
2. Chloride Ion (Cl⁻)
* Chloride ions are formed when a chlorine atom gains one electron.
* This extra electron goes into the 3p subshell, filling it completely.
* The electron configuration for chloride ion is: 1s² 2s² 2p⁶ 3s² 3p⁶
Therefore, the electron configuration for chloride ion (Cl⁻) is 1s² 2s² 2p⁶ 3s² 3p⁶.
