Question

Analyse the table and fill in the blanks:

Gas	Atomic mass	Molecular mass	Atomicity
Oxygen	16	48	-
Nitrogen	14	-	2

Answer 1

Atomicity is basically the number of atoms in the molecules of an element or we can say the total number of atoms that composes a molecule is known as its atomicity. In older contexts atomicity was used in the same sense as the valency.

Complete step by step answer:
We have been provided a table with some missing entities, so firstly we will make calculations and find out the missing entities for oxygen.
Given:
Atomic mass of oxygen=$16$
Molecular mass of oxygen=$48$
To calculate: Atomicity=?
As we all know that, $Atomicity = \dfrac{{Mol.mass}}{{At.mass}}$
Therefore for oxygen,
$Atomicity = \dfrac{{48}}{{16}} = 3$
Now we will calculate missing entities for nitrogen gas.
Given:
Atomic mass of oxygen=$14$
Atomicity=$2$
To calculate: Molecular mass=?
As we all know that, $Atomicity = \dfrac{{Mol.mass}}{{At.mass}}$
Therefore, $Mol.mass = Atomicity \times At.mass$
So, for nitrogen
$Mol.mass = 2 \times 14 = 28$
Hence the molecular mass of nitrogen gas is $28gm/mol$ .
Hence the completed table is as following:

Gas	Atomic mass	Molecular mass	Atomicity
Oxygen	16	48	3
Nitrogen	14	28	2

Note:
Atoms are the basic structural units of matter and the defining structure of elements. Basically the atom word came from a Greek word which means indivisible, so we can say that atom is the smallest particle in the universe which cannot be further divided.