Question

What is the formula for this compound?

1 atom of copper, 1 atom of sulfur, 4 atoms of oxygen

Answer 1

The third one:
`CuSO_4`

Step-by-step explanation:

Again you are going to want to look at a periodic table so you can determine the symbol of each atom.

The symbol for copper is Cu, the symbol for sulfur is S and the symbol for Oxygen.

There is 1 atom of copper in the compound

So we have Cu

There is 1 atom of sulfur in the compound

So we would have CuS

There are 4 atoms of oxygen in the compound

So we would have
`CuSO_4`

Note that the little number at the bottom left after each symbol indicates how many atoms of that element are in that compound.