MEDIUM
9th CBSE
IMPORTANT
Earn 100

Explain how cathode rays are formed from the gas taken in the discharge tube.

Important Questions on Structure of Atom

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 55
What conclusion is obtained from the fact that all the gases form cathode rays?
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 56
Describe Thomson's model of the atom. Which subatomic particle was not present in Thomson's model of the atom?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 56
The mass number of an element is18. It contains 7electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 57
Describe Rutherford's model of an atom. State one drawback of Rutherford's model of the atom. 
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 57

The mass number of an element is 23and it contains 11electrons. What is the number of protons and neutrons in it? What is the atomic number of the element? 

HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 58
Describe Bohr's model of the atom. How did Neils Bohr explain the stability of the atom?
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 58
An element has an atomic number of 11and its mass number is 23. What is the arrangement of electrons in the shells? State nuclear composition of an atom of the element.
EASY
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Long Answer Type Questions>Q 59
What is meant by an atomic number of an element? Explain with the help of an example.