Question

Complete the following table.​

(i)

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
9​	-​	10​	-​	-​	-​

(ii)

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
16​	32​	-​	-​	-​	Sulphur​

(iii)

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
16​	32​	-​	-​	-​	Sulphur​

(iv)

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
-​	2​	-​	1​	-​	-​

(v)

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
-​	1​	0​	1​	1​	-​

Answer 1

We know that, ​

Mass number = Number of protons + Number of neutrons​

For a neutral atom, ​

Atomic number = Number of protons = Number of electrons​

Using the above information, we can complete the given table in the following way:​

Given,​

Atomic number = 9​

Number of neutrons = 10​

Number of protons = 9 = No. of electrons​

Mass number = 9 + 10 = 19​

The element with atomic number 9 is Fluorine.​
The complete table is

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
9​	19​	10​	9​	9​	Fluorine​

(ii)

We know that, ​

Mass number = Number of protons + Number of neutrons​

For a neutral atom, ​

Atomic number = Number of protons = Number of electrons​

Using the above information, we can complete the given table in the following way:​

Given,​

Atomic number = 16​

Mass number = 32​

Number of neutrons = Mass number – Number of protons​

Number of neutrons = 32 – 16 = 16​

Number of protons = 16 = No. of electrons​

The completed table

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
16​	32​	16​	16​	16​	Sulphur​

(iii)

We know that, ​

Mass number = Number of protons + Number of neutrons​

For a neutral atom, ​

Atomic number = Number of protons = Number of electrons​

Using the above information, we can complete the given table in the following way:​

Given,​

Mass number = 24​

Number of protons = 12​

Hence, atomic number = 12​

Number of neutrons = Mass number – Number of protons​

Number of neutrons = 24 – 12 = 12​

Number of protons = 12 = No. of electrons​

An element with atomic number 12 is magnesium.
The complete table is

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
12​	24​	12​	12​	12​	Magnesium​

(iv)

We know that, ​

Mass number = Number of protons + Number of neutrons​

For a neutral atom, ​

Atomic number = Number of protons = Number of electrons​

Using the above information, we can complete the given table in the following way:​

Given,​

Mass number = 2​

Number of protons = 1​

Hence, atomic number = 1​

Number of neutrons = Mass number – Number of protons​

Number of neutrons = 2 – 1 = 1​

Number of protons = 1 = No. of electrons​

The name of the element is deuterium. It is an isotope of hydrogen.​
The complete table is

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
1​	2​	1​	1​	1​	Deuterium​

(v)
Given,​

Mass number = 1​

Number of neutrons = 0​

Number of protons = 1​

Number of electrons = 1​

We know that atomic number is the number of protons present in the nucleus of an atom. Hence, ​

Atomic number = 1​

An element with one proton and no neutron is hydrogen. Therefore, the table can be completed as,​

Atomic number​	Mass number​	Number of neutrons​	Number of protons​	Number of electrons​	Name of the Atomic species​
1​	1​	0​	1​	0​	Hydrogen​