-
400
Aristotle
Fire
Earth
Water
Air -
460
democritus
created the first atomic model -
john dalton
proposed his modern theory of the atom -
William Conrad Roentgen
discovered x-rays while using cathode-ray tubes. -
J.J. Thomson
he discovered the plum pudding model of the atom -
Hantaro Nagaoka
Nagaoka developed an early, incorrect "planetary model" of the atom. -
Ernest Marsden
He discovered the existence of the atomic nucleus. -
Ernest Rutherford
Theorized that atoms have their positive charge concentrated in a very small nucleus. -
Niels Bohr
Presented a picture of an atomic structure. -
Henry Moseley
Moseley's law advanced atomic physics -
Louis de Brogile
He developed a theisis of important findings. -
Erwin Schrödinger
He generated a mathematical model for the distribution of electrons in an atom. -
James Chadwick
He proved the existence of neutrons.