g/m2 can't be a unit of density.
'm2' is not a unit of volume.
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The unit "g over m2" is not an SI unit for density. SI unit for density is kg/m3 or g/cm3 or g/mL, which all represent mass per unit volume. The unit "g over m2" represents mass per unit area, not mass per unit volume.
In this case, the element with a density of 3.0 g/cm3 is likely to be aluminum (Al). Aluminum has a density of approximately 2.7 g/cm3, which is close to 3.0 g/cm3.
The standard unit of density is kilograms per cubic meter (kg/m^3).
In the SI system the unit is kg/m3; in practice g/cm3 is used.
Density is the mass of a substance divided by its unit volume. It is measured in units such as g/cm3 or kg/m3.
A cubic centimetre is a unit of capacity. An ounce is a unit of mass. Without some unit of density to compare, the two units are incompatible.