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440 BCE
First ever concept of atom
Democritus gave the idea of small partials that form everything -
opposition of Aristotle
john Dalton he proved that all common elements always broke down into same elements -
Negative charge???
JJ Thomas discovered the electron a particle which is negatively charged -
Father of the nuclear age
Reatherford was able to discover that electrons orbited around a nucleus -
bohr model
Niels Bohr discovered that electron orbit the nucleus at fixed energy -
"speed and position of electron"
Heisenberg's theory was anyone cannot determine the position and speed of an electron at the same time