Atomic Structure

Discovered the electron using cathode ray tube

• Joseph Thomson
• John Dalton
• Ernest Rutherford
• Robert Millikan

First measured the mass and charge of an electron

• Joseph Thomson
• Robert Millikan
• John Dalton
• Niels Bohr

His atomic model included a dense positive core in an atom, surrounded by negatively charged particles

• Joseph Thomson
• Niels Bohr
• Ernest Rutherford

This particle is found in the nucleus and has no charge

• Neutron
• Proton
• Electron

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

• Electron
• Proton
• Neutron

This is a negatively charged particle found outside the nucleus

• Electron
• Proton
• Neutron

The first person to ever talk about an atom was

• Democritus
• Rutherford
• Dalton

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

• Democritus
• Dalton
• Thomson
• Borh

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.MS-PS1-1

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.