NCERT Class 9 Science Solutions: Chapter 4 – Structure of the Atom Part 5 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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:

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?

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
Atomic numberMass numberNumber of NeutronsNumber of protonsNumber of electronsName of the Atomic species
9-10---
1632---Sulphur
-24-12--
-2-1--
-1011-

A.

Table Contains Name of Atoms and Its Atomic Stucture
Atomic numberMass numberNumber of NeutronsNumber of protonsNumber of electronsName of the Atomic species
9191099Fluorine
1632161616Sulphur
1224121212Magnesium
12111Deuterium
11011Protium

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