CARTER FINLEY

DEMOCRITUS

• DEMOCRITUS WAS AN ANCIENT GREEK PHILOSOPHER. HE LIVED FROM 460 BCE TOM370 BCE.
• Only a few fragments of his work survive but he was the first to discover "invisible atoms"
• Described atoms as the basis for all
• Best known for his atomic theory
• Explained that all changes in the world were changes in the movement of atoms

DEMOCRITUS'S THEORY

• If you keep breaking matter in half, how many breaks will you have until you can't break it anymore?
• Called these basic matter particles, atoms
• For more than 2000 years nobody continued the Greeks exploration of matter
• Not until the early 1800's did people start to question the structure of matter again

ARISTOTLE

• the atomic theory of Democritus was not considered right by other Greek philosophers
• Aristotle dismissed the theory as worthless
• People considered aristotles opinions very important so they believed the theory was worthless too.

ERNEST RUTHERFORD

ERNEST RUTHERFORD

• Born August 30, 1871 in Brightwater near Nelon city in New Zealand
• He got a scholarship to Cambridge and worked in the cavendish laboratory
• Gold foil experiment

GOLD FOIL EXPERIMENT

• Shot alpha rays through gol foil and hypothesized that the alpha rays particles would pass through the foil
• When he did the experiment he noticed that although most alpha rays did pass right through some we're deflected
• This showed the atom is made up of mainly empty space except for the nucleus in the middle

ERNEST RUTHERFORD AND DEMOCRITUS

• The first idea of an atom came from Democritus
• Rutherford showed that the nucleus holds most of an atoms mass

SOURCES

• Http://www.nobeliefs.com/atom.html
• Http://library.thinkquest.org/19662/low/eng/biog-rutherford.html
• Http://www.chalkbored.com/lessons/chemistry-atomic-models-handout.pdf