Why is ##ZnCl_2## a lewis acid?

##ZnCl_2## is a Lewis acid because it can accept an electron pair from a Lewis base.

A Lewis acid is a molecule that can accept an electron pair and a Lewis base is a molecule that can donate and electron pair. When a Lewis base combines with a Lewis acid an adduct is formed with a coordinate covalent bond.

A zinc atom has the [Ar]4s²3d¹⁰.

Using only the s electrons, theory predicts ZnCl₂ to have a linear AX₂ structure with only four valence shell electrons. This is an incomplete octet. Thus, ZnCl₂ will behave as a Lewis acid in an attempt to acquire more .

In many of its , Zn has eight or twelve .

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