NCERT Class 9 Science Solutions: Chapter 4 – Structure of the Atom Part 5

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Question 17:

Q. Put tick against correct choice and cross against wrong choice in the following question:

Number of valence electrons in ion are:

Image of Cl- Ion for Structure Of The Atom

Image of Cl- Ion for Structure of the Atom

(a) 16

A. 16

(b) 8

A. 8

(c) 17

A. 17

(d) 18

A. 18

Question 18:

Q. Which one of the following is a correct electronic configuration of sodium?

Image of Sodium for Structure of The Atom

Image of Sodium for Structure of the Atom

(a) 2, 8

(b) 8, 2, 1

(c) 2, 1, 8

(d) 2, 8, 1

A. The correct electronic configuration of sodium is 2, 8, 1.

Question 19:

Complete the following table.

Table Contains Name of Atoms and Its Atomic Stucture
Table Contains Name of Atoms and Its Atomic Stucture

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

1

-

A.

Table Contains Name of Atoms and Its Atomic Stucture
Table Contains Name of Atoms and Its Atomic Stucture

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

1

Protium

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