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400 BCE
Democritus
Democritus was an influential Ancient Greek Philosopher primarily remembered by his atomic theory of the universe. He proposed that matter was made of tiny things called atoms. His idea was later rejected. It rejected because he didn't have the necessary equipment. -
John Dalton
John Dalton was an English chemist, physicist, and meteorologist. He is best known for his work in pioneering and the development of modern atomic theory; and his research into color blindness, sometimes referred to as Daltonism, in his honourish chemist. His ideas form the atomic theory of matter. He said all elements are composed of atoms. Also all elements are different.Also the elements can combine to make compounds. -
J.J Thompson
Sir Joseph John Thomson OM PRS was an English physicist. He was elected as a fellow of the Royal Society of London and appointed to the Cavendish Professorship of Experimental Physics at the Cambridge University's Cavendish Laboratory in 1884.He was the person who found the electrons with gas discharge tubes. He found a move which was later on called the cathode rays. It was made up of metal plates. -
Lord Ernest Rutherford
Lord Ernest Rutherford was a New Zealand Physicist who later became known as the father of nuclear physics. His famous experiment was called the gold foil experiment. This experiment showed that atoms are made of a small nucleus and the protons get pushed away an dthe the atom takes up no space at all. -
Niels Bohr
Neils Bohr was a Danish Physicist. He made a model similar to the solar system. The electrons go around the nucleus like how the planets go around the sun. Number of electrons can only be on one shell or another. If a electron moves then it will lose energy if it goes down a lvel and the same thing will be for going higher.
