Question

How the formual of lead iodide is derived by valence electrons show it ?

Answer 1

lead iodide
that is
PbI2
lead has two valence electrons
and iodide has one valence electron so we exchanged it
hope you understand it
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Answer 2

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!