in the beginning of class, mr.Doktor told us we were gonna go through a review of grade 9 chemistry, going through isotopes-->(different number of neutrons) etc. and he showed us a review of atomic theory.

ATOMIC THEORY

Early atomic theory
Greeks – in 300 BC Democritus said atoms were indivisible particles
(that matter can be divided up into a certain point until you wouldn’t be able to cut down any further)
-Democritus was the first person to mention atoms. – other than that everything else he said was wrong.
-Not testable- no predictions and no information to test whether it was right or wrong.
- cannot be used to explain a chemical reactions.

LAVOISIER(late 1700s) came up with 2 things:
law of conversation of mass & law of definite proportions
- wasn't a true atomic theory b/c it didn't discuss what atoms were or how they were arranged.

PROUST(1799)
-if a compound is broken down into its constituents, the products exist in the same ratio as in the compound.
- experimentally proved Lavoisier laws.

DALTON(early 1800s) 1803-1805
-atoms are solid, indestructible spheres (like billiard balls)
-provides for different elements( these would be diff spheres)
- does not mention subatomic particles
- cannot explain isotopes
-no mention of the nucleus

the grade 12's had to leave for the honors assembly and that is as far as we got. we were given handouts to work on for homework though, 3-1 EXPLORE