MEDIUM
9th CBSE
IMPORTANT
Earn 100

The atomic number and the mass number of certain elements are given below in the table.
Element A B C D E F
Atomic number 1 3 8 18 20 1
Mass number 2 7 16 40 40 1

Select a pair of isobar and isotope from the above table.

Important Questions on Structure of the Atom

EASY
9th CBSE
IMPORTANT
The atomic number and the mass number of certain elements are given below in the table.
Element A B C D E F
Atomic number 1 3 8 18 20 1
Mass number 2 7 16 40 40 1

What would be the valency of elements B and E.
MEDIUM
9th CBSE
IMPORTANT
What are the features and drawbacks of Rutherford's nuclear model of an atom?
EASY
9th CBSE
IMPORTANT
How did discovery of protons take place?
EASY
9th CBSE
IMPORTANT
Why do helium, neon and argon have zero valency?
EASY
9th CBSE
IMPORTANT
What are inert elements? Why are they called so?
EASY
9th CBSE
IMPORTANT
What is the valency of inert gas elements and why?
EASY
9th CBSE
IMPORTANT
How many electrons can be accommodated in a M and N-shell?
MEDIUM
9th CBSE
IMPORTANT
Draw the atomic structures of the following elements: Magnesium, silicon, sulphur.