Which of the following exists as molecules?
(i) Oxygen gas
(ii) Argon
(iii) Ammonia
(iv) Helium
(v) Water
(vi) Sugar
Generally, 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.