Question

If the valency of iodide is 2 why is the formula of lead iodide is PbI2

Answer 1

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Lead iodide (PbI2)

Valency of Lead - 2

Valency of Iodine - 1

On crossing, we get Pb × 1 and I × 2

i.e. PbI2.

Hope it helps!

Answer 2

Answer:

Actually iodide is I^- and has valency of 1

Explanation:

Its valency is one bcos it is a halogen and needs nly one elcetron.Pb has valency of 2.

So using crisscross method we get PbI2

Pb2+ + 2I- ----->PbI2