Which of the following are molecules?
(i) O2
(ii) Argon
(iii) Ammonia
(iv) Helium
(v) Water
(vi) Sugar
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
Ammonia is a molecule consisting of 1 atom of Nitrogen and 3 atoms of Hydrogen.
Water is a molecule consisting of 1 atom of Oxygen and 2 atoms of Hydrogen.
Sugar is a molecule consisting of 12 atoms of Carbon, 22 atoms of Hydrogen and 11 atoms of Oxygen.