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He created the scientific method of analysis, he get the credit with categorizing fields of knowledge such as psychology, biology, politics, logic, chemistry, and botany.
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All matter around us is made of indivisible tiny particles- “atomos”
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He is considered father of modern chemistry, thanks to his discovery of the conservation of matter.
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Created Dalton's Atomic Theory
Dalton’s Atomic Theory
1) Elements are made of tiny particles called atoms.
2) Atoms of one element are identical while atoms of different elements are different.
3) Conservation of atoms
4) Different atoms form compounds in constant ratios. -
He created the periodic table by arranging the chemical elements in order of their atomic weights and recording their symbols
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Discovered atoms have negative particles; electrons. He also discovered electron’s charge to mass ratio
1.76 x 108 C/g -
Measured the charge of an electron.
Electron’s charge: 1.60x 10-19 C
Electron’s mass: 9.11 x 10-28 g -
Positive charge is not like a pudding, but concentrated in the nucleus as shown in the Gold Foil
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He discovered Bohr's Orbit model
*Electrons orbit the nucleus.
*Model based on the hydrogen atom
*Energy of the electrons is quantized. -
He discovered the neutron, his discovery led to the splitting of Uranium-235 and ultimately to the development of the first atomic bomb
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