The formula for lithium oxide is Li2O.
It's not a real compound
The compound lithium oxide is written as Li2O. This indicates that it is composed of two lithium atoms and one oxygen atom.
The formula for the binary compound of calcium and oxygen is CaO. This compound is known as calcium oxide.
The formula for platinum(IV) oxide is PtO2. Platinum has a 4+ oxidation state in this compound, which is represented by the Roman numeral IV in its name.
This is the formula for Copper (II) Oxide Copper has two possible oxidation numbers (+2 or +1) since there are no written subscripts for in the formula CuO, copper's oxidation number must have been +2 (If it had been +1, the formula would be Cu2O and the name of the compound woould be Copper (I) Oxide)
The chemical formula of calcium oxide is CaO.
Fe2O3 is Iron 3 oxide
I believe it's Dinitrogen Pentoxide. You make put Di in front of Nitrogen because of there is two and pent in front of oxide because there is five.
CuBr2 is often referred to as copper bromide. A more precise name is cupric bromide, which specifies that the copper is in the +2 state, and to distinguish it from cuprous bromide, with copper in the +1 state. It may also be written as copper (II) bromide.
We don't know who did this, but we'll figure it out soon.
MgO, since both have a charge of 2 therefore they cancel each other out.
FeO