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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​

-​


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Solution

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​


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