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Atomic Theory


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Dalton's atomic theory of matter
said that atoms were the smallest particles of matter
Thompson's plum pudding model
said that atoms contained negative particles and positive particles
Rutherford's atomic model
said that atoms had a nucleus made up of protons and neutrons surrounded by orbits of electrons
Brownian motion
continuous random motion of particles in a fluid
scientific theory
explains existing evidence and observations
law of constant composition
the ratio of elements in a compound is always the same
Atoms
are made up of protons, neutrons and electrons
Nucleus
The centre of an atom, composed of neutrons and protons, and possessing most of the mass.
Neutrons
Part of the nucleus, they have no electric charge
Electrons
Orbit around the nucleus, they have a positive charge
Gold Foil experiment
showed that atoms consisted mostly of empty space
Proton
Part of the nucleus, they have a positive charge