· The atom of an element is still having very small particles in it.They are
called as sub-atomic particles.These are the basic constituents of an atom.
· The protons, neutrons, and electrons are the fundamental particles of an
atom of an element.
· The study of the fundamental particles in the atom is essential for
understanding the behavior of matter.
Electron:
It was discovered by J.J Thomson
It was denoted by “ e¯” symbol
It is having 1 unit of negative charge on it
Proton:
It was discovered by “Gold Stien”
It was denoted by “P” (or) “P+” (or) “H+”
It is having 1 unit of positive charge on it
Neutron:
It was discovered by “James Chadwick”
It was denoted by “n” (or) ‘n’
It is having no charge on it (neutral)
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