- Stated that atoms were different in form, position and magnitude; all things were made of atoms, and atoms were small, full, unbreakable, pore-less and homogeneous.
ANTOINE LAVOISIER
- Proved the law of conservation of mass around 1789.
JOHN DALTON
- Formed the atomic theory: all matter is composed of tiny, indestructible particles.
JJ THOMSON
- discovered the election
ERNEST RUTHERFORD
- Atomic model made.
- Using gold foil experiment, discovered alpha and beta rays and presumed electrons were located outside nucleus.
ROBERT MILLIKAN
- Using falling-drop method, proved that the charge was a constant for all electrons therefore demonstrating atomic structure of electricity.
MARIE CURIE
- Studied radioactivity; concluded that the ability to radiate didn't depend on arrangement of the atoms in a molecule but that it has to be linked to the interior of the atom itself.
JAMES CHADWICK
- Proved the existence of neutrons: particles without electrical charge.
- The neutron has a similar mass to a proton.
MAX PLANCK
- Originator of quantum theory.
- Discovered that light was released in heat sources in a pattern of frequencies for different elements.
ALBERT EINSTEIN
- Established the law of mass, theory of relativity and using Planck's theory, formulated photon theory of light.
LOUIS DE BROGILE
- Believed electrons acted like particles and waves
- Waves produced by electrons contained in orbit had certain energy, frequency and wavelength
JOSEPH LOUIS PROUST
- Established law of definite composition and law of definite portions
ERWIN SCHRODINGER
- Combined equations for behaviour of waves with Brogile's equation of electrons in atom.
NIEHL'S BOHR
- Propsed Bohr model (modified Rutherford model)
- Proposed that electrons travel in certain successively larger orbits.
- Electrons jump from outer to inner orbit which emits light
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