Answer:
CaO
how:
since its an iconic compound (metal(Ca)+non-metal(O)=iconic(CaO) we have to take account the charges
so;
[tex]Ca^{+2}[/tex] [tex]O^{-2}[/tex]
now we will cross them
[tex]Ca_{2} O_{2}[/tex]
since both the values are same will cross it out.
hence: CaO
