EASY
9th CBSE
IMPORTANT
Earn 100

Lithium atom has an atomic mass of 6 u and three protons in its nucleus. How many neutrons does it have?

Important Questions on Structure of the Atom

MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>Check Point 03>Q 4
An atom has an atomic mass of 7 u. It has 2 electrons in K-shell and one electron in L-shell. How many neutrons does it have?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>Check Point 03>Q 5
Why are the atomic masses of most of the elements are fractional and not whole numbers?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>Check Point 03>Q 6
Identify the isotopic pair(s) out of the following species?
C816,C146,N14,O18,N16787
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>Check Point 03>Q 7
Name the isotope used as a fuel in nuclear reactors.
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>Check Point 03>Q 7
What is the number of subatomic particles in U-235 isotope?
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 1
The cathode ray experiment was done for the first time by
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 2
How many neutrons are present in the nucleus of a hydrogen atom?
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 4 - Structure of the Atom>CHAPTER EXERCISE>Q 3
Which of the following correctly represent the electronic distribution in the Mg atom?