Multiple Choice Question Answer III — task. Science CBSE, Class 9.

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1. Mass number of electron is -

Number of electron and protons in the atom
Number of protons in its nucleus
Number of neutrons in the nucleus
Number of neutrons and protons ins the nucleus

2. Electron, proton and neutron are found in atom

Atom of various element have same properties
Atoms are destroyed in the chemical reaction
Electrons, proton and neutron are found in atom
Atom is indivisible

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