10 c. lead (II) nitrate

the Roman numeral indicates the charge of the lead ion

Pb²⁺ and NO₃^1-

all compounds must be neutral; need to make total positive charge equal total negative charge

for polyatomic ions, if you need to indicate more than one in a formula, put parentheses around the polyatomic ion and put the subscript to indicate how many outside the parentheses.

Pb(NO₃)₂