Q2 of 23 Page 34

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Almost all the mass of an atom is concentrated in a small region of space called the _______.

nucleus


Explanation: Rutherford proposed that the mass of an atom is concentrated in the nucleus. The volume of nucleus is very small as compared to the volume of an atom.


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1

The reason for the existence of isotopes is change in

 2

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The total number of protons and neutrons in the nucleus of an atom is known as ________ .

 2

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The particle of an atom that has no charge is _________ .

 2

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The fundamental particle not present in a normal hydrogen atom is _________ .