What is the total number of atoms found in one molecule of upper case H subscript 2 end subscript upper case O?

The total number of atoms is 3 atoms

Explanation:

A molecule is a particle of an element or a compound that is made up of two or more atoms. The atoms in a molecule may be different or similar. Molecules of an element are made up of similar atoms, for example, Oxygen and chlorine molecules. Molecules of a compound contain different types of atoms from elements. For example, a water molecule is made up of two atoms of hydrogen and one atom of oxygen. One molecule of Upper case H subscript 2 end subscript upper case O (H₂O) has a total number of three atoms. A molecule of water is made up of two hydrogen atoms and one oxygen atom.