give reason: Li does not form alum like other alkali metals.
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Alums are double sulphate salts with the formula,AM(SO4)2.12H2O where A is a monovalent cation like potassium or ammonium & M is a trivalent cation like aluminium or chromium.These crystallise in octahedral crystal structures can accommodate ions of only specific size.Size of lithium is small as comparison to potassium & ammonium & therefore cannot be accommodated in the crystalline structure.
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lithium becomes large in size while it is being hydrated then why can't it form alum then?
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