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Proposed a mechanical universe with a small solid masses in motion
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He Made the positive charge a pluse sign (+) and and negative sign (-)
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The matter is made of atoms, you cant see atoms there indivisible.Atoms are giving a element are the same in mass and propertiesCompounds are made by combination of to different types of atoms.Atoms cant be destroyed
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Michael Faraday studied the effect of splitting of molecules with electricity.
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A atom is shaped as a sphere of a positive charge with negatively chred electron embedded in it.Postive and negative charges in the atom are the same magnitude, due to a atom is electrically neutral is had no negative or positive charge
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Saturnain model of a atom with right of electrons moving around with a positively charged particle
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Robert Millikan put a tiny drop of oli and messure how strong applied electric field. Be determined the charge on an electron
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Ernest Rutherford discovered the atomic nucleus
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The planetary model was proposed by Bohr after studying a hydrogen atom in 1915
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Proposed electric magnetic fields filled with void
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De Broglie Discovered that electrons had a dual nature simular to both particles and waves.
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He Viwed Elrons and continuous clouds and brought in wave mechanics as a mathematical model of a atom
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James Chadwick discovered a neutral atom particle with a mass close to a proton.
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Enrico Fermi Conducted the first controlled chain reaction releasing engergly from atoms nucleus
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Democritus was born on 460 BC and died on 370 BC he was born in adbera, ThraceThis theory was That the atom is very small can not be indivisible.