Which is the heaviest and lightest particle in an atom ?

Which is the heaviest and lightest particle in an atom ?
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1 Answer

Answer :

The heaviest particle in an atom is the neutron and the lightest particle is the electron.
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Who was the first scientist whose alpha particle scatterring experiment led him to conclude that the the nucleus of an atom contains a dense center of positive charge is?

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What is the Particle in a nucleus of an atom it has a positive electrical charge and it's 2000 times the mass of the electron?

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