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John Dolton
He thought that all matter is made up of individual particles called atoms, which cannot be broken down. he made wooden spheres to represent the atoms of different elements. -
J.J Thomson
He thought that all atoms are made up of even smaller particles. He used a sealed tube of gas in his experiments. -
Hantaro Nagaoka
He thought that all atoms have a central nucleus. Electrons move in central orbits like the rings around saturn. He created a planetary model of an atom. -
Ernest Marsden
He suggested that atoms have a small, dense, positively charged nucleus. He scattered alpha particles off a gold foil and observe large angles of scattering. -
Ernest Rutherford
Scientists sometimes get unexpexted results,but his led to discoveries. He used a model to show that all of an atoms positive charge is concentrated in its nucleus. -
Niels Bohr
He thought that electrons move at a constant speed in fixed orbits around the nucleus. He used an orbital and electron clouds. -
Louis de Broglie
He thought that all moving particles like electrons have some properties of waves. He used something called the de Broglie wavelength. -
Erwin Schrodinger
He approached wave mechanics to the atomic theory. He used mathmatical equation. -
James Chadwick
He confirms the existence of neutrons, which have no charge. He used a sample of beryllium and combined it with particles. -
Aristotle
He thought that all substances were built up from four elements.
He used a model that described matter. As phylosophers, they came up with their own thoughts. -
Democritus
Postulated the theory of atoms and void; the universe is made
up of empty space and a nearly infinite number or invisible
particles differing in arrangement, form, and position. He
stated that all all matter is composed of indivisible atoms. As phylosophers, they came up with their own thoughts.
