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Question		Answer
What did Democritus suggest? start learning		Everything is made of tiny particles called atoms
What was Daltons model? start learning		Atoms were tiny solid spheres and different elements had different atoms
What did J.J. Thomson discover? start learning		The electron and plum pudding model
What was the plum pudding model? start learning		A ball of positive charge with negative electrons embedded inside
What experiment did Rutherford carry out? start learning		The gold foil alpha scattering experiment
What did Rutherford discover? start learning		Atoms are mostly empty space within a small positive nucleus
What did Chadwick discover? start learning		The neutron
What was the order of the history of the atom? start learning		Democritus-idea of atoms, John Dalton-solid sphere model, J.J. Thomson-electron discovered + plum pudding model, Ernest Rutherford-nucleus, Niels Bohr-electrons in the shell, James Chadwick-neutron

Chemistry - History of the Atom