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Scientist Timeline

Democritus- 430 B.C.

Democritus, a philosopher in ancient Greece, suggests that matter is made of atoms, but he can't prove it. Atom is Greek for "unbreakable".

Plato- 400 B.C.

A famous Greek philosopher who came up with the world "element".

Aristotle- 335 B.C.

Robert Millikan- 1923

Received a Nobel Prize in physics for measuring the negative charge of electrons.

Aristotle teaches that the world is not made of atoms but of four elements- earth, air, water and fire.

Niels Bohr- 1913

Bohr discovered that the number of electrons in the outer shell determine its chemical properties. Introduced the "solar system" model, but is also called the Bohr Model.

Henry G.J Mosely- 1913

J.J. Thomson- 1897

Mosely, a British scientist came up with today's Periodic Table based on atomic number.

Thomson was an English scientist who finds electrons. He decides that an atom is a positively charged sphere in which there are also tiny negatively charged particles called electrons. This is called the "plum pudding" model.

Pierre and Marie Curie- 1890-1910

Ernest Rutherford- 1911

Worked with radium to learn more about radioactive elements. Discovered that radioactive elements lose their electrons over time.

Albert Einstein- 1905

Rutherford was an English scientist who discovered that atoms consist of a positively charged nucleus that has electrons rotating around it at great speeds.

Dimitri Mendeleev

Mendeleev was a Russian scientist show constructed the first Periodic Table of Elements - which was arranged the elements' atomic mass.

Einstein published the Theory of Relativity which explains the mass and energy in atoms.

John Dalton- 1803

Dalton proves that atoms exist. He determines a compound's element breakdown, then calculates the weight of each atom. However, he only thinks a compound has only one atom of an element, so water is HO. His model of the atom is called the "billiard ball".

Amadeo Avogadro- 1810

Avogadro discovers that a compound can have more than one atom of an element, as in H2O.

Antoine Lavoiser- 1789

Lavoiser was a French chemist who proves Boyle's theory and who developed the theory of conservation of mass which states that the mass of object can never be destroyed or created - it can only change form.

Robert Boyle- 1670

Boyle reports that elements can't be broken down and that compounds are combinations of elements.

The Alchemists- 700-1500 A.D.

A type of scientist who lived during the Middle Ages who believed they could turn other substances to gold. (This is impossible!)

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