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Aristotle

Responsible for summarizing matter

Democritus

First person to coin the term atom ("atomos")

Boyle

Any substance of 2 or more parts is not an element, instead a compound

Lavoisier

Father of modern chemistry, introduced experimentation, said an element only has one component, water is a compound, and a compound = two or more elements

Cavendish

Worked with a gas that made water when it was burned; Lavoisier names it hydrogen or "water former"

Priestly

Worked with a gas that in the presence of water produced an acid, caused candles to burn brighter, and charcoal to burn hotter; Lavoisier names it oxygen or "acid former"

Proust

Found the mass ratio used to create water (8 grams oxygen + 1 gram hydrogen = 9 grams water)

Dalton

First to postulate the atomic theory; thought that water was OH

Gay-Lussac

2 L Hydrogen + 1 L Oxygen = 2 L Water; discovered that hydrogen and oxygen are diatomic elements

Avogadro

At constant temperature and pressure, equal volumes of gases contain the same # of particles

Thompson

Did the cathode ray tube experiment and found that atoms have negative portions and leads to the plum pudding model of the atom (negative particles suspended in a positive field)

Rutherford

Did the gold foil experiment using radiation, gave us the proton

Chadwick

Discovered that neutrons have the same mass as protons, but are a neutral charge

Mendeleeve

Arranged the periodic table, and noticed that the elements have periodic behavior

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