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9th CBSE
IMPORTANT
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The first model of an atom was given by

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Important Questions on Structure of the Atom

MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 18
An atom with 3 protons and 4 neutrons will have a valency of
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 19
The electron distribution in an aluminium atom is
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 20

Which of the following in figure do not represent Bohr's model of an atom correctly? 

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EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 21
Which of the following statement is always correct?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 22
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
(i) Rutherford's atomic model 
(ii) Thomson's atomic model 
(iii) Bohr's atomic model
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 23
The fundamental particle not present in hydrogen is _____.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 24
In neutral atoms, number of electrons are equal to number of _____.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 25
α-Particles are positively charged.