SCH3U1 Chem Test 1

all matter is made up of small individual particles called atoms

Democritis

• Matter has atoms
• Each element is made of diff. types of atom
• different atoms have different properties
• 2 or more atoms can be binded to make substances
• atoms cannot be created, destroyed, or subdivided

Dalton

Dalton

Dalton

• electric current causes chemical changes in compounds
• matter contains positive and negative charges

J.J. Thomson shot an anode (negative particles) to a cathode (positive) with two positive and negative plates. The Particles repelled from negative to positive. 

Shows that atom is a positively charged sphere with negatively charged particles

Ernest Rutherford did the gold foil experiment, where alpha (+) particles shot through gold foil. Some went straight through but others diverged because deflected positive particles in gold

Shows that atom is a positively charged sphere with negatively charged particles through his anode and cathode experiment

Gold foil experiment, found the proton (atom contains positively charged nucleus surrounded by mostly empty space)

uncharged neutrons in nucleus

Chadwick

• Subdivision
• Same atom of element can have different properties

Rutherford