what is the valency of gold, silver and lead and can you explai how we can find the valency of a compound like NH4, SO2, CO3 etc.

Dear student!
As far as you ask for valencies of elements then, these elements have variable valencies.

valency of gold = 1,3 depending on compound (most common 3)

valency of silver = 1,3 depending on compound(most common 1)

and valency of lead  = 2, 4  depending on compound(most common 2)

But, the neutral compounds can not have valencies however elements or ion could have valencies. so we could not determine valencies of the compounds given.

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