Atomic Theory and Structure (Honors)

Electrons can be found in

• The protons
• The nucleus
• Electron Clouds

This is the SI unit used for the masses of atomic particles

• ion
• amu
• moles
• grams

This contains most of the mass of an atom

• Electron Cloud
• Nucleus
• Electron
• Ions

The weighted average of the masses of all naturally occurring isotopes of an element is

• Atomic number
• Atomic mass
• Mass number
• Neutrons

The first person to ever talk about an atom was

• Democritus
• Rutherford
• Dalton
• Bohr

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Thomson
• Ernest Rutherford
• John Dalton
• Democritus

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.

What is the smallest particle of an element?

• atom
• proton
• electron
• neutron