atomic time line
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1807 John Dalton revived the idea of the atom.
He thought that the atom was the smallest particle and a solid sphere like a billiard ball
he came up with the billiard ball model and atomic theory
1897J.J. Thomson discovered the electron
plum pudding modelshowed the atom as a positive sphere with negative particles throughout
1911Ernest Rutherford discovered the nucleus
nuclear model shows protons in the nucleus and electrons outside
everything is made of atomsall atoms of an element are identical in mass & propertiescompounds are combinations of different types of atomsa chemical reaction is a rearrangement of atoms
1913Niels Bohr discovered energy levels
bright line spectrum
his experiments with the cathode ray tube showed that atoms contain subatomic particles with negative charges
1926Erwin Schrodinger and quantum mechanics
he shot a ray alpha particles at a piece of gold foil some of the particles were reflected and he concluded that a tiny, dense nucleus was responsible
Proton- subatomic particle with a positive charge found in the nucleus
Atom- the basic unit of matter
Energy level-the fixed amount of energy can a system have
explained the bright line spectrum on a hydrogen atom by assuming that electrons moved in a circular pattern. Also that electrons only exist on certain energy levels.
He established the electron cloud where electrons are most likely to be found
Electron- a subatomic particle found in the electron cloud with a negative charge
Neutron- a subatomic particle with the same mass as a proton and a neutral charge
Orbital- patterns of potential electron density in an atom
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