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400
Democritus
Found the invisible atom. -
Antoine Lavoisier
discovered that mass is neither created nor destroyed in chemical reactions. -
John Dalton
He proposed atomic theory with spherical solid masses in motion. -
Robert Millikan
Found out the eletric charge of the electron. -
Daltons Atomic Theory.
Dalton's theory was based on the premise that the atoms of different elements could be distinguished by differences in their weights. -
Gold foil experiment
The gold foil experiment consisted of a series of tests in which a positively charged helium particle was shot at a very thin layer of gold foil. -
Dmitri Mendeleev
He discovered that the properties of elements were perodic functions of their atomic weights. -
Cathode Ray Tube
is a vacuum tube containing an electron gun (a
source of electrons or electron emitter) -
Quantum Mechanical Model
The Quantum atomic model is the most recent model of the atomt's based on quantum mechanics. -
J.J. Thomson
He described atoms as a ball of positive charge containting a number of electrons. -
Electron Cloud Model
The electron cloud model is an atom model wherein electrons are no longer depicted as particles moving around the nucleus in a fixed orbit. -
Plum pudding atomic model
each atom was a sphere filled with a
positively charged fluid. The fluid was called the "pudding." -
Rutherford model
the components of the atom had been discovered. The atom consisted of subatomic particles called protons and electrons -
law of conservation of mass
chemical
engineering, and physics. -
Bohr Planetary Model
an atom that had all of the protons and neutrons clustered
together in a nucleus at the center of the atom. -
Neils Bohr
Stated that the electron moved around in the nucleas in large orbits. -
Henry Moseley
Moseley developed the application of X-ray spectra to study atomic structure. -
Erwin Schrodinger
He proposed the "Electron Cloud Theory, -
Ernest Rutherford
Rutherford deterimed that the nucleas of an atom is very dense and has a positive charge. -
James Chadwick
Chadwick proved the existance of neutron and discovered a particle within the nucleas.
