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8 Cards in this Set

  • Front
  • Back

Aristotle

Aristotle believed that all matter was composed of fire, earth, water and air

Democritus

Proposed the idea of indivisible particles called atoms

Robert BOYLE

Gases are made up of tiny particles that group together to make different substances

Antoine LAVOISER

law of conservation of mass

John Dalton

Imagined all atoms were small spheres


Model he used to explain matter:


-Small, indivisible particles called atoms


-All the atoms of an element are identical in properties such as size and mass


-Atoms of different elements have different properties


-Atoms of different elements can combine in specific fixed ratios to form new substances

J.J Thomson

Discovered electrons

Ernest Rutherford

Discovered the nucleus

Neils Bohr

Proposed electrons surrounded the nucleus in specific energy levels