Question

Use the crossover method to find the chemical formula of a calcium oxide

Answer 1

Answer:

CaO

how:

since its an iconic compound (metal(Ca)+non-metal(O)=iconic(CaO) we have to take account the charges

so;

$Ca^{+2}$ $O^{-2}$

now we will cross them

$Ca_{2} O_{2}$

since both the values are same will cross it out.

hence: CaO