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Chapter 4 Structure Of The Atom Solutions

Question - 31 : -
Put tick () against correct choice and cross () against wrong choice in the following question:

Isotopes of an element have

(a) the same physical properties
(b) different chemical properties
(c) different number of neutrons
(d) different atomic numbers

Answer - 31 : -

Isotopes of an element have

(a) the same physical properties
(b) different chemical properties
(c) different number of neutrons
(d) different atomic numbers           

Question - 32 : -
Put tick () against correct choice and cross () against wrong choice in the following question:

Number of valence electrons in Cl− ion are:

(a) 16

(b) 8

(c) 17

(d) 18

Answer - 32 : -

Number of valence electrons in Cl− ion are:

(a) 16           
(b) 8         
(c) 17        
(d) 18          



Question - 33 : -
Which one of the following is a correct electronic configuration of sodium?
(a) 2, 8
(b) 8, 2, 1
(c) 2, 1, 8
(d) 2, 8, 1

Answer - 33 : -

(d) The correct electronic configuration of sodium is 2, 8, 1.

Question - 34 : -
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

−

24

−

12

−

−

−

2

−

1

−

−

−

1

0

1

0

−

Answer - 34 : -

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 ion

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