HARD
8th Maharashtra Board
IMPORTANT
Earn 100

The number of electrons of some elements is given here. By using it write the electronic configuration, number of valence electron and valency of the respective elements.

Element Li C Mg O
Number of electrons 3 6 12 8
Electronic configuration        
Number of valence electrons        
Valency        

 

Important Questions on Inside the Atom

EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Use your brain power>Q 4
Why are the atomic numbers and atomic mass numbers always in whole numbers?
HARD
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Use your brain power>Q 5
Sulphur contains 16 protons and 16 neutrons. What would be its atomic number and mass number?
HARD
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Complete the table

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EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Exercises>Q 1

What is the difference in the atomic models of Thomson and Rutherford?

EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Exercises>Q 1

What is meant by Valency of an element? What is the relationship between the number of valence electron and valency?

MEDIUM
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Exercises>Q 1
What is meant by atomic mass number? Explain how the atomic number and mass number of carbon are 6 and 12 respectively.
HARD
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Exercises>Q 1

What is meant by sub-atomic particle? Give brief information of three sub-atomic particles with reference to electrical charge, mass and location.

EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Exercises>Q 2
Why all the mass of an atom is concentrated in the nucleus.