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460
Democritus
Democritus theory included “1.All matter consists of invisible particles called atoms.2. Atoms are indestructible. 3. Atoms are solid but invisible.4. Atoms are homogenous.5. Atoms differ in size, shape, mass, position, and arrangement. ->Solids are made of small, pointy atoms. ->Liquids are made of large, round atoms. ->Oils are made of very fine, small atoms that can easily slip past each other.”He created this theory and information in 465BC. -
John Dalton
-Daltons theorized that all matter is made of atoms that can be combined. -Atoms of the same element are exactly alike.-Atoms of different elements are different.-Atoms of two or more elements can be combined to form new substances. -
J.J. Thompson
Thompson he discovered that atoms are not just simple solid spheres. He discovered electrons small particles out side the nucleus with a negative charge. -
Ernest Rutherford
He fired a stream of positively charged particles at a thin sheet of gold foil most particles when right through the gold atoms. He concluded that the atoms were mostly made of space.-Some particles were deflected by the nucleus.All of the positively charged particles are in the nucleus, and the negative surrounding it. -
Bohr
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Erwin Schrodinger
He took Neil Boar’s concept 1 step further, and contributed a way to find an electrons position using mathematical equations. -
Werner Heisenberg
Werner's contribution to the atomic theory was that he calculated the behavior of electrons, and subatomic particles that also make up an atom. Instead of focusing mainly on scientific terms, this idea brought mathematics more into understanding the patterns of an atom's electrons. -
James Chadwick
He helped contribute to the atomic theory creating experiments, and helps put fourth more information on discovering the nucleus, and the neutron.
