Question

Classify the following into molecules of an element and molecules of a compound:

Cl2, H2O, HCl, H2 and mention the atomicity of H2O and HCl.​

Answer 1

Answer:

Atomicity is defined as the total number of atoms that constitute a molecule. For example, each molecule of oxygen (O2) is composed of two oxygen atoms. So atomicity of oxygen is 2.[1]In older contexts, the term atomicity is sometimes used in the same sense as valency.

On the basis of atomicity, molecules can be classified as :

Monoatomic-composed of 1 atom e.g. He, Ne, Ar (all noble gases are monoatomic)

Diatomic-composed of 2 atoms e.g. H2 , N2 , O2

Triatomic-composed of 3 atoms e.g. O3

Polyatomic-composed of 3 or more atoms e.g. P4 , S8

All metals and some other elements, such as carbon, do not have a simple structure but consist of a very large and indefinite number of atoms bonded together. Their atomicity cannot be determined and is usually considered as 1.

Atomicity may vary in different allotropes of the same element

Answer 2

Answer:

Following are molecules of an element because they are made of the same element.

Cl2

H2

Following are molecules of compound because they are made of different elements.

H2O

HCl

Atomicity of

H2O - 3  ( one atom of oxygen and 2 atoms of hydrogen.)

HCl - 2   ( one atom of hydrogen and one atom of chlorine)

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