Two, as hydrogen is a diatomic element
Hydrogen is H2, a diatomic gaseous element
There are 2 oxygen atoms in 1 molecule of oxygen.
A molecule of of water contain 3 atoms.
There are three oxygen atoms in the molecule HNO3.
A molecule of serotonin has 26 atoms in total.
2 atoms
A molecule contain atoms.
There are two atoms of Hydrogen in the molecule.
There are four hydrogen atoms in an ethanal molecule, CH3CHO.
There are three carbon atoms and three oxygen atoms in each pyruvate molecule.
There are two atoms of hydrogen in a molecule of H2O2.
Two atoms in the formula unit (not molecule): Na and Cl.