Question

who is jj thomson and John dalton

Answer 1

They both defined the structure of an atom in their own ways.
J. J. Thomson was the first person to discover the electrons and sub atomic particles of an atom for which he even received the Noble prize.
John Dalton is best known for proposing the modern atomic theory.

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Answer 2

jj Thomson is the dicoverer of electrons and isotopes and the subatomic particle.
sir John Daltons investigations are concerned with atomic theory in chemistry.
sir in Thomson also give the plum pudding model.