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427 BCE
Plato
Plato founded the Atom theory it states that a geometric forms serve as atoms -
400 BCE
Democritus theory of atoms.
Democritus theory says Atoms are hard, uniform, solid, incomsesible, -
384 BCE
Aristotle
Aristotle's method used information from observations to infer general principles to check against more observation -
Lavoisier's atomic model
Lavoisier's Atomic model was grounded by the law of conservation mass. -
John Dalton
he first part of his theory states that all matter is made of atoms, which are indivisible. The second part of the theory says all atoms of a given element are identical in mass and properties. The third part says compounds are combinations of two or more different types of atoms.
John Dalton's theory says that all mater is made of atoms and that all atoms of a given element are identical in mass -
law octaves
If elements are put in weight order similar elements will happen after each interval of 8 -
Mendeleev's periotic table of the elements
Mendeleev made the periodic table of elements some elements on the table are (H) hydrogen (O) oxygen (C) carbon. -
Photoelectric effect Heinrich Rudolf Hertz
The photoelectric effect says that electrically charged particles
The photoelectric effect say that electrically charged particles are from or within a material -
Discovery of the electron JJ Thomson
the electron is a negative charged particle located in the nucleus -
Discovery of radioactivity
Radioactivity is the release radiation into the air radiation is danger to humans -
Charge of the electron
The electron is just outside the nucleus while both the electrons and protons are in the nucleus a electrons has a negative charge while a proton has a positive charge. and neutrons have a neutral charge of zero. -
Discovery of the proton Ernest Rutherford
A proton holds a positive charge a neutron holds a neutral charge and electrons holds a negative charge. protons were named protons because in Greek pro means first. -
Planck's quantum
According to Planck's quantum theory, Different atoms can absorb of emit a certain amount of energy at a time. -
Plum pudding model
The plum pudding model is a model of a atom with electrons surrounded by positive energy -
Rutherford's gold foil experiment
A piece of gold is hit with positive charge most particles pass through so gold is mostly empty space -
Robert Millikan
Robert MIlikan's atomic model showed how scientists can calculate the weight of a electron his discoveries contributed to the modern Atomic model. -
Bohr's planetary model
the electrons encircle the nucleus of the atom in a specific way Allowing paths called orbits -
Robert Millikan
Robert Millikan's discover of element charge says the charge is equal to the charge of the protons minus the number of electrons -
Mosley's Atomic numbers
in 1914 Mosley published a paper which atomic numbers are positive charge in the nucleus -
Schrödinger's equation
Schrödinger's equation governs the wave function of a quantum-mechanical system -
Heisenberg's Uncertainty principle
The principle of uncertainty states that we cannot know speed and position of a particle like a electron or proton. -
Discovery of the neutron James Chadwick.
The neutron was first theorized by Ernest Rutherford and discovered in 1932 by James Chadwick. -
"The alchemist"
"The alchemist" is a novel by Paulo Coelho.
