Atomic Theory

This contains most of the mass of an atom

• Electron Cloud
• Nucleus
• Electron

The first person to ever talk about an atom was

• Democritus

• Rutherford

• Dalton

• Artistotle

All matter is made of what?

• energy 
• atoms 
• electrons 
• compounds 

How did Rutherford discover the proton?

• Cathode tube ray experiment
• Gold Foil Experiment
• Planetary Model
• Plum Pudding Model

What contribution did John Dalton make to atomic theory? 

• He discovered that every atom was positively charged. 
• He discovered that every element consisted of one type of atom.  
• He discovered that atoms had nuclei. 
• He discovered that atoms could be divided into smaller parts. 

J.J. Thomson provided evidence that an atom...

• is the smallest particle of matter
• contains negatively charged particles
• has an overall negative charge
• has an overall positive charge

Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.
• alpha particles have a positive charge.
• gold is not a dense as previously thought.
• there is a dense positively charged nucleus at the center of an atom.

People have always agreed that matter is made of atoms.

• True
• False

What does "atomos" mean?

• easily divided
• unable to be divided
• really small
• sometimes divided

Which scientist is credited with discovering the electron?

• John Dalton
• JJ Thomson
• Ernest Rutherford
• Werner Heisenberg