Complete the following table. | Chemistry class 9 ncert solution


Q.19:- Complete the following table.

Atomic number

Mass number

Number of neutrons

Number of protons

Number of electrons

Name of the atomic species

9

10

16

32

Sulphur

23

12

2

1

1

0

1

0

 

Answer:-

First Line : Mass number = Atomic number (9) + No. of neutrons (10) = 19

No. of protons = Atomic number = 9
No. of electrons = Atomic number =9
Name of the species = Fluorine (F)
Second Line : No. of neutrons = Mass number (32) – Atomic number (16) = 16
No. of protons = Atomic number =16
No. of electrons = Atomic number =16
Third Line : Atomic number = No. of protons = 12
No. of neutrons = Mass number (24) – Atomic number (12) =12
No. of electrons = Atomic number =12
Name of the species = Magnesium (Mg)
Fourth Line : Atomic number = No. of protons = 1
No. of neutrons = Mass number (2) – Atomic number (1) = 1
No. of electrons = Atomic number =1
Name of the species = Deuterium (D).
Fifth Line : Atomic number = No. of protons = 1
No. of electrons = Atomic number = 1
Name of the species = Protium or Hydrogen (H)
The complete table can also be represented as :

Atomic number

Mass number

Number of neutrons

Number of protons

Number of electrons

Name of the atomic species

9

19

10

9

9

Fluorine

16

32

16

16

16

Sulphur

12

24

12

12

12

Magnesium

1

2

1

1

1

Deuterium

1

1

0

1

0

Hydrogen