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Molecules and Atomicity

Classify each...

Question

Classify each of the following on the basis of their atomicity:
(a) $F_{2}$
(b) $N O_{2}$
(c) $N_{2} O$
(d) $C_{2} H_{6}$
(e) $P_{4}$
(f) $H_{2} O_{2}$
(g) $P_{4} O_{10}$
(h) $O_{3}$
(i) $H C l$
(j) $C H_{4}$
(k) $H e$
(l) $A g$

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Solution

(a) Atomicity is the total number of atoms present in a molecule or compound.
$F_{2}$ has 2 atoms of fluorine.
Therefore, fluorine $F_{2}$ is a di-atomic molecule.

(b) Atomicity is the total number of atoms present in a molecule or compound.
$N O_{2}$ has 1 atom of nitrigen and 2 atoms of oxygen.
Therefore, nitrogen dioxide $N O_{2}$ is a tri-atomic molecule.

(c) Atomicity is the total number of atoms present in a molecule or compound.
$N_{2} O$ has 1 atom of oxygen and 2 atoms of nitrogen.
Therefore, nitrous oxide $N_{2} O$ is a tri-atomic molecule.

(d) Atomicity is the total number of atoms present in a molecule or compound.
$C_{2} H_{6}$ has 2 atoms of carbon and 6 atoms of hydrogen.
Therefore, ethane $(C_{2} H_{6})$ is an octa-atomic molecule.

(e) Atomicity is the total number of atoms present in a molecule or compound.
$P_{4}$ has 4 atoms of phosphorous.
Therefore, tetra phosphorous $P_{4}$ is a tetra-atomic molecule.

(f) Atomicity is the total number of atoms present in a molecule or compound.
$H_{2} O_{2}$ has 2 atoms of H and 2 atoms of O, so its atomicity is 4.
Therefore, hydrogen peroxide $(H_{2} O_{2})$ is a tetra-atomic molecule.

(g) Atomicity is the total number of atoms present in a molecule or compound.
$P_{4} O_{10}$ has 4 atoms of phosphorous and 10 atoms of oxygen.
Therefore, $P_{4} O_{10}$ is a polyatomic molecule.

(h) Atomicity is the total number of atoms present in a molecule or compound.
$O_{3}$ has 3 atoms of oxygen.
Therefore, $O_{3}$ is a tri-atomic reaction.

(i) Atomicity is the total number of atoms present in a molecule or compound.
$H C l$ has 1 atom of hydrogen and 1 atom of chlorine.
Therefore, hydrogen chloride $(H C l)$ is a diatomic molecule.

(j) Atomicity is the total number of atoms present in a molecule or compound.
$C H_{4}$ has 1 atom of carbon and 4 atoms of hydrogen.
Therefore, $C H_{4}$ is a penta-atomic molecule.

(k) Atomicity is the total number of atoms present in a molecule or compound.
Helium $(H e)$ is a mono atomic gas as noble gases do not combine and exist as mono atomic molecules.
Therefore, $H e$ is a mono-atomic.

(l) Atomicity is the total number of atoms present in a molecule or compound. Metals don't have a simple structure but consists of very large and indefinite number of atoms bonded together. Hence, atomicity of all metals is considered as 1.
Silver $(A g)$ has one atom of silver.
Therefore, $A g$ is mono-atomic.

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Classify each of the following on the basis of their atomicity

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