Two.
There are 2 oxygen atoms in 1 molecule of oxygen.
ONE oxygen molecule (O2) contains two atoms of oxygen (O).
There are 3 atoms in an oxygen molecule (O2).
There are 2 atoms and 3 molecules in oxygen.
in the oxygen that we breath there is 2 atoms (O2)
4 atoms in total. Oxygen is a diatomic molecule, so there is 2 atoms per molecule.
2
Dichromate is Cr2O7^2- so it has 7 oxygen atoms in one molecule
well, i think there would be 2 hydrogen atoms and 1 oxygen atom for every molecule of H2O, so...do the math
the water molecule is H2O so it has 2 atoms of hydrogen in it. (plus an atom of oxygen)
Molecules of oxygen exist in two relatively stable allotropes: breathable oxygen with the formula O2, and ozone with the formula O3. The little number indicates that these molecules are composed of (respectively) two or three oxygen atoms.
Most oxygen molecules are composed of two atoms of oxygen, and we frequently refer to oxygen as O2 (or O2) for this reason. Oxygen can also exist as the molecule called ozone, which is O3. Ozone is unstable, and will revert to O2 in a few minutes.