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I want to know why the formula of mercurous chloride is Hg2Cl2 and why can't it be written as HgCl (simple ratio) ?
Dear BHANU,
Mercury (I) chloride also known as Mercurous chloride or calomel has been used for centuries and is a well known compound.Crystallographic studies on the compound show that in the crystalline form it has the following structure:Cl-Hg-Hg-ClThe is a Hg-Hg bond, making the compound a dimer, hence the Hg2Cl2 formula.
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This is because in the natural state is formed as Hg2Cl2. There is some intermolecular forces which keep the two molecules together. This is similar to the case of Aluminium Chloride. In nature it is found as Al2Cl6. But in theory it is also written as AlCl3. So, as far as theory is concerned it doesn't really matter how you write but it is prefered to write as Hg2Cl2.
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this is a quite different case.
here there is metallic bonding between two Hg atoms.
it is bonded as ( Hg+--Hg+). thus on whole used as ne single molecule Hg22+
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