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▎a) Electronic Configuration of Chlorine The atomic number of chlorine (Cl) is 17, which means it has 17 electrons. The electronic configuration of chlorine can be written as follows: 1. The first energy level (1s) can hold a maximum of 2 electrons:     • 1s² 2. The second energy level (2s and 2p) can hold a maximum of 8 electrons:     • 2s² 2p⁶ 3. The third energy level (3s and 3p) can hold the remaining 7 electrons:     • 3s² 3p⁵ Putting it all together, the electronic configuration of chlorine is:  1s² 2s² 2p⁶ 3s² 3p⁵ ▎b) Composition of Chlorine Molecule by Electron Dot Structure Chlorine exists as a diatomic molecule (Cl₂) in its elemental form. In the electron dot structure (also known as Lewis dot structure), we represent the valence electrons of the atoms involved. 1. Valence Electrons of Chlorine:    • Chlorine has 7 valence electrons (from its configuration: 3s² 3p⁵). 2. Electron Dot Structure for Cl₂:    • Each chlorine atom will contribute its 7 valence electrons, and they will share one pair of electrons to form a covalent bond. The electron dot structure for the chlorine molecule (Cl₂) can be represented as follows:    :Cl: + :Cl: → :Cl::Cl: In this representation: • Each colon (:) represents a pair of shared electrons (the bond). • Each chlorine atom has three remaining unshared valence electrons, which are not shown in the bond but are implied. Thus, the Cl₂ molecule has a single covalent bond between the two chlorine atoms, and each atom retains three unshared valence electrons.