Explain monatomic, diatomic, and triatomic molecules.

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Solution

The number of atoms constituting a molecule is known as its atomicity.
Depending upon the number of atoms, molecules can be:

Monatomic- A molecule which contains only one atom. Example: Helium, neon, etc.

Diatomic- A molecule which contains two atoms. Example: Hydrogen molecule, nitrogen molecule, etc.

Triatomic- A molecule which contains three atoms. Example: Carbon dioxide, water, etc.

Molecules containing more than 3 atoms are considered as polyatomic molecules.

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Question 4

Give examples for diatomic and triatomic molecules?

\frac{C_{p}}{C_{v}}

Column - I Molecule Type	Column -II $\frac{C_{p}}{C_{v}}$
$(A)$ Monatomic	$(I) \frac{7}{5}$
$(B)$ Diatomic rigid molecules	$(I I) \frac{9}{7}$
$(C)$ Diatomic non-rigid molecules	$(I I I) \frac{4}{3}$
$(D)$ Triatomic rigid molecules	$(I V) \frac{5}{3}$

(a) Write the chemical formula of Aluminium Sulphate?

(b) Give examples for diatomic and triatomic molecules?

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