Write the electron configuration for each ion. a. Cl^-

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Step 1: Identify the atomic number of the neutral atom. The atomic number of Chlorine (Cl) is 17, which means a neutral chlorine atom has 17 electrons.

Step 2: Determine the charge of the ion. In this case, the ion is Cl^-, which means it has gained one electron.

Step 3: Add the number of gained or subtract the number of lost electrons from the atomic number to find the total number of electrons in the ion. Since Cl^- has gained one electron, it has 18 electrons in total.

Step 4: Write the electron configuration for the neutral atom first. The electron configuration of a neutral chlorine atom (17 electrons) is 1s² 2s² 2p⁶ 3s² 3p⁵.

Step 5: Add the extra electron to the highest energy level (n=3). The electron configuration of Cl^- is 1s² 2s² 2p⁶ 3s² 3p⁶.

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Electron Configuration

Electron configuration describes the distribution of electrons in an atom or ion's orbitals. It is represented using a notation that indicates the energy levels and sublevels occupied by electrons. For example, the electron configuration of a neutral chlorine atom (Cl) is 1s² 2s² 2p⁶ 3s² 3p⁵, which shows how electrons are arranged in various energy levels.

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Electron Configuration Example

Ionic Charge

Ionic charge refers to the electrical charge that an atom or molecule acquires when it gains or loses electrons. Anions, like Cl⁻, are negatively charged ions formed when an atom gains one or more electrons. This additional electron alters the electron configuration, resulting in a more stable arrangement, often resembling that of the nearest noble gas.

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Formal Charge

Noble Gas Configuration

Noble gas configuration is a shorthand notation for electron configurations that highlights the stability of noble gases, which have full outer electron shells. For chlorine, gaining an electron to form Cl⁻ results in the electron configuration resembling that of argon (Ar), which is 1s² 2s² 2p⁶ 3s² 3p⁶. This configuration indicates a stable, filled outer shell.

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