Air has a density of 0.001293 g/cm³. Which of these gases would make a balloon float in air? Check all that apply.

nitrogen, density: 0.001251 g/cm³
carbon monoxide, density: 0.001977 g/cm³
helium, density: 0.000178 g/cm³
carbon dioxide, density: 0.001977 g/cm³
hydrogen, density: 0.00009 g/cm³
oxygen, density: 0.001429 g/cm³