Free CBSE Class 9 Science Structure Of Atom Worksheets

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Sample CBSE Class 9 Science Structure Of Atom Worksheet Questions

Why is the valency of Argon atom zero?
What were the drawbacks of Rutherford’s model of an atom?
Write the one use of isotope of uranium.
The atomic number and mass number of an element are 5 and 11 respectively. Calculate the valency of it.
The ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to be spherical, what will be the ratio of their sizes?
State True/False: The electrons do not radiate energy while revolving in discrete orbits.
1. 1 2. 0
State True/False: The volume of nucleus is much smaller than that of the atom so when a gold foil is bombarded by a beam of ? particle, only a few of them get deflected whereas most go straight undeflected.
1. 1 2. 0
State True/False: Protium, isotope of Hydrogen has 1 neutron.
1. 1 2. 0
The atomic mass of two isotopes of Chlorine atoms are 35 and 37. If their composition are 75 % and 25 % respectively. Find the atomic mass of chlorine.
The atomic number and mass number of an element are 31 and 70 respectively. Calculate the number of neutrons in it.

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