Yes, it is correct. Calcium has a +2 charge, and the hydroxide polyatomic ion has a -1 charge.
Nope... it is not.
Calcium hydroxide.
Calcium hydroxide.
The correct formula for iron(ll) bromide is FeBr2.
The correct formula for Barium carbonate is BaCO3.
The correct formula for nitrogen trioxide is NO3.
Al2S3
NF3
The correct formula for silver (I) nitrate is AgNO3.
The correct molecular formula for methylpropane is C4H10.
Li2S2O8
The correct formula for gallium oxide is Ga2O3.