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John Dalton
John Dalton discovered that all elements always breakdown to the same components known as atoms. Atoms cannot be created or destroyed. -
JJ Thomson
JJ Thomson discovered the electron. His model represents a plum cake or blueberry muffin showing a positive "cake" embed by negatively charged electrons. -
Ernest Rutherford
Ernest Rutherford was JJ Thomson's student. He discovered that atoms are mostly empty space with nuclei that are very small. -
Niels Bohr
Niels Bohr is also one of JJ Thomson's students. He discovered that electrons orbit the nucleus and can jump from level to level. He also discovered that electrons travel in a wave like pattern. -
James Chadwick
James Chadwick later proved the existence of neutrons (which are neutrally charged).