People Who Discovered Atoms

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developed many lab techniques

Alchemists

tried to turn metal to gold

Alchemists

Proved and defined the idea of an element

Anton Lavoisier

took ideas from Robert Boyle and Democritus

Anton Lavoisier

believed that everything was made out of four elements

Aristotle

Atomos= indivisible

Democritus

all matter is made up of particles so small that they could not be cut any smaller.

Democritus

predicted the existence of unknown elements at the time and left spaces.

Dmitri Medeleev

First to organize all the known elements

Dmitri Mendeleev

organized based on atomic masses and chemical behavior of elements

Dmitri Mendeleev

# of protons=# of electrons

Ernest Rutherford

atom was mostly empty space, found protons inside the atom, ran into plump of protons, or also known as nucleus.

Ernest Rutherford

Created Gold Foil Experiment

Ernest Ruthford

discovered elements with green glow, created his model of the atom.

J.J. Thomson

discovered there was negatively charged elements in atoms.

J.J. Thomson

James Chadwick

James Chadwick

A compound is made up of 2 or more elements and are combined in a specific ratio

John Dalton

Different elements atoms are different

John Dalton

all elements are composed of atoms that cannot be divided

John Dalton

atoms cannot be created or destroyed in a chemical change.. they are merely rearranged

John Dalton

father of atomic theory

John Dalton

same elements atoms are identical

John Dalton

1st orbital = 2 electrons 2nd orbital= 8 electrons 3rd orbital= 18 electrons 4th orbital= 32electrons

Niels Bohr

closest to the nucleus electrons are least energy, farther to the nucleus has more energy.

Niels Bohr

First to propose the idea of element

Robert Boyle

Invented the cathode (Crookes) ray tube

William Crookes


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