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John Dalton
John Dalton performed a number of experiments that led him to accept the idea of the Atoms, he found the Atoms which had the same elements are all exactly the same. -
J.J. Thomson
J.J. Thomsonhad provided a hint that atoms are made of smaller particles, the particles he found that atoms are had from a positively charged substance with negatively charged electrons scatterd inside. -
Ernest Rutherford
Ernest Rutherford had been hard at work on an expriment which involved firing a stream of tiny postive charged particles onto a thin sheet of gold foil this was how he figured that there was a nucleus in the center of the atoms, he also found that an atom's positvely charged particles are contained in the nucleus. -
Niels Bohr
Niels Bohr had found that an atoms elections don't stay in one spot but that they orbit around the nucleus like all the planets do with the sun -
Democritus
Democritus worked out the you could not cut am Atom into small individual pieces.