Question

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

Answer 1

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