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1. Name the fundamental particles which constitute an atom.

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What is an Electron?

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What is a proton?

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Who discovered neutron?

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5. What is a neutron?

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What is the name of the remaining part of atom except outer orbit?

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Name the particles which determine the mass of an element.

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What are α-particles?

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9. Why were neutrons discovered very late?

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10.

What are the fundamental particles present in a neutral atom having atomic number greater than 1?

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