MEDIUM
9th ICSE
IMPORTANT
Earn 100

What is meant by the statement that “the atomic number of sodium is eleven”?

Important Questions on Atomic Structure

MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 3
Atoms consist of protons, electrons and neutrons. What do you understand by protons, neutrons and electrons?
MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 3
Draw a diagram representing the atomic structure of the following:
(i) Sodium atom (Z = 11; A = 23)
(ii) Chlorine atom (Z = 17; A = 35)
(iii) Carbon atom (Z = 6; A = 12)
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 4
What is meant by “atomic number” of an element?
MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 4

Complete the table below (where A, B, C and D are elements) given B is an inert gas (not helium though):

Element Atomic number Number of electrons in outermost orbit
A Z-1  
B Z  
C Z+1  
D Z+4  

Which of the elements A, B, C and D given above would you expect to be (i) Metallic (ii) Non-metallic

MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 5
What is meant by the following:
(i) Atomic number of calcium is 20.
(ii) The atomic mass or mass number of calcium is 40.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 5
How can it be explained that: Sodium (Z=11) readily forms ions whereas neon (Z=10) does not.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 6
The atom of an element (X) has 4 protons, 5 neutrons and 4 electrons. Write down its atomic number and atomic mass (mass number).
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 6

State what do you understand by the following

(i) Electronic configuration of an element.
(ii) Atomic number of an element.