Chem 3.4-3.5

The first person to propose a theory about an atom was

• Democritus
• Rutherford
• Dalton
• Aristotle

This particle is found in the nucleus and has no charge

• Neutron
• Proton
• Electron
• Orbital

Tags

NGSS.HS-PS1-8

This particle is found in the nucleus and has a positive charge

• Electron
• Proton
• Neutron
• Neutral

Tags

NGSS.HS-PS1-8

This is a negatively charged particle found outside the nucleus

• Electron
• Proton
• Neutron
• Orbital

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 & atoms are mostly empty space.

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

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

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. 

Tags

NGSS.HS-PS1-7

What scientist first developed 4 rules for atomic theory, and helped kick start modern chemistry?

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

Tags

NGSS.HS-PS1-7

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

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

Who stated that all atoms of the same element are exactly alike?

• Democritus
• Dalton
• Thomson
• Borh