Unit 3: Building Blocks of Matter, Stoichiometry, & Famous Dead Guys

Vocabulary flashcards covering the key scientists and their primary contributions to atomic theory as outlined in Unit 3: Building Blocks of Matter, Stoichiometry, & Famous Dead Guys.

Democritus

Developed early Atomic Theory and named the atom.

Roger Bacon

Advocated for the Scientific Method.

Alchemists

Developed many experimental methods.

Antoine Lavoisier

Established the Law of Conservation of Matter/Mass.

Joseph Proust

Established the Law of Definite Composition/Proportions.

John Dalton

Proposed __________s Atomic Theory (the start of modern atomic theory) and the Law of Multiple Proportions.

William Crookes

Discovered cathode rays, which provided the first evidence of electrons.

J.J. Thomson

Discovered the electron and calculated its charge-to-mass ratio.

Max Planck

Stated that energy is quantized; recognized as a founder of Atomic Theory.

Albert Einstein

Explained the photoelectric effect.

Robert Millikan

Calculated the charge and mass of an electron.

Ernest Rutherford

Discovered the nucleus.

Henry Moseley

Discovered that the positive charge of the nucleus increases by one unit from one element to the next.

Niels Bohr

Developed the planetary model of the atom.

Louis de Brogile

Proposed the wave-particle duality of matter.

Erwin Schrodinger

Developed wave equations and viewed electrons as continuous clouds.

Werner Heisenberg

Formulated ________s Uncertainty Principle.

James Chadwick

Discovered the neutron.