Q2 of 23 Page 34

Fill in the blanks with suitable words:

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

neutron


Explanation: There are three fundamental particles which are protons, electrons and neutrons. Among them, the fundamental particle that is not present in a normal hydrogen atom is neutron.



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Fill in the blanks with suitable words:

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

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Fill in the blanks with suitable words:

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

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Fill in the blanks with suitable words:

The atomic mass of an atom is 23 and its atomic number is 11. the atom has _________ neutrons.

 3

Answer the following:

State the postulates of Dalton’s atomic theory.