a) State the electronic configuration of a chlorine atom.

a) State the electronic configuration of a chlorine atom. b) Describe the bonding and the phase of chlorine at room temperature.

The electronic configuration of a chlorine atom can be expressed as 1s² 2s² 2p⁶ 3s² 3p⁵. This configuration indicates that chlorine has a total of 17 electrons, which are distributed across three energy levels. The first energy level contains two electrons in the 1s subshell, the second energy level has eight electrons distributed between the 2s and 2p subshells, and the third energy level contains seven electrons, with two in the 3s subshell and five in the 3p subshell. This arrangement reflects chlorine’s position in Group 17 of the periodic table, where it is classified as a halogen.

Chlorine exhibits a unique bonding characteristic due to its high electronegativity and tendency to form covalent bonds. In its diatomic molecular form (Cl₂), two chlorine atoms share a pair of electrons, resulting in a stable bond that allows each atom to achieve a full outer shell, thereby attaining a noble gas configuration. This covalent bonding is crucial for the stability of chlorine molecules, which are commonly found in various chemical reactions and compounds. The ability of chlorine to form bonds with other elements further enhances its reactivity, making it a significant participant in numerous chemical processes.

At room temperature, chlorine exists as a greenish-yellow gas, which is a result of its molecular structure and the nature of its intermolecular forces. The diatomic molecules of chlorine are held together by weak van der Waals forces, which are not strong enough to condense the gas into a liquid under standard atmospheric conditions. Consequently, chlorine remains in the gaseous phase, exhibiting a pungent odour and a high level of reactivity. Its gaseous state at room temperature is indicative of its low boiling point, which is approximately -34 degrees Celsius, further emphasising its volatility and the importance of handling it with care in both laboratory and industrial settings.
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