Question

why AlCl3 dimerise itself​

Answer 1

Answer:

Aluminium chloride is a chemical symbol of ALCL3

Answer 2

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Consequently, the molecules pair up or dimerize so that each Aluminium atom has a share of eight electrons in its outer shell. Al is a lewis acid because it has an incomplete octet/empty p orbital. Cl is a lewis base because it has lone pairs. When a lewis acid and a lewis base come together, they form a bond.

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@Mahor2111