historical figures

Dalton

Made three laws from his atomic theory

Three laws from atomic theory

Law of constant composition, multiple proportions, and conservation of mass

Law of multiple proportions

Whole # ratios

Constant composition

Ex: CO2 can come from many sources

Conservation of mass

Same amount from start of chemical reaction to end

Thompson experiment

Plum pudding

Thompson

Found charge to mass ratio of electrons

Milligan experiment

Oil drop

Milligan

Found charge of electron

Rutherford experiment

Gold foil

Rutherford

Proved nucleus, disproved plum pudding

Chadwick

Discovered neutrons

Rontgen

Discovered x-ray

Becqeurel

Discovered radioactivity

Curies

Radioactive elements and their properties

Mendeleev

Made part of the periodic table