Questions: Write the electron configuration for a chlorine anion with a charge of -1.

Transcript text: Write the electron configuration for a chlorine anion with a charge of -1.

Solution

Step 1: Determine the Atomic Number of Chlorine

Chlorine (Cl) has an atomic number of 17, which means it has 17 protons and, in its neutral state, 17 electrons.

Step 2: Account for the Anion Charge

A chlorine anion with a charge of -1 (Cl\(^-\)) has gained one additional electron. Therefore, it has 18 electrons in total.

Step 3: Write the Electron Configuration

The electron configuration is written by filling the orbitals in the order of increasing energy levels. The order is as follows: 1s, 2s, 2p, 3s, 3p.

Adding these up: \(2 + 2 + 6 + 2 + 6 = 18\) electrons.

\[ \boxed{1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6} \]

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