Atomic Theory

The word atom comes from a Greek word "atomos" that means

• Invisible
• Indivisible
• Undivided
• Indestructable 

This particle is found in the nucleus and has no charge

• Neutron
• Proton
• Electron
• Orbital

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NGSS.HS-PS1-8

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

• Electron
• Proton
• Neutron
• Neutral

This is a negatively charged particle found outside the nucleus

• Electron
• Proton
• Neutron
• Orbital

The first person to propose a theory about an atom was

• Democritus
• Rutherford
• Dalton
• Aristotle

Some atoms are large enough to see with your eyes.

• True
• False

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.

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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. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

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