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9th CBSE
IMPORTANT
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The difference between isotopes and isobars

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Important Questions on Structure of the Atom

HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 14
'A' has 9 protons, 9 electrons and 10 neutrons. 'B' has 12 protons, 12 electrons and 12 neutrons. Formula between A and B is
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 15
In a sample of ethyl ethanoate CH3COOC2H5 the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it? 
HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 16
Elements with valency 1 are
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9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 4 - Structure of the Atom>ASSESS YOURSELF>Q 17
The first model of an atom was given by
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?