Evidence for Atomic Structure

Who is the philosopher that stated that there must be some indivisible unit and called it an atom?

• Democritus

• Aristotle

• Dalton

• Thomson

Atoms combining in whole number ratios was evidence that (select all that apply)

• You cannot have a fraction of an atom and it still be the same element

• Atoms are the smallest unique division of matter

• There must be a a negative and positive particle within the atom

• There must be a neutral particle within the atom

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NGSS.HS-PS1-7

His experiments led to the idea of a negative subatomic particle

• Bohr

• Dalton

• Thomson

• Rutherford

Experiments with alpha particles and gold foil, led to the discovery of

• negative electron

• electron energy levels

• neutral neutron

• a positive nucleus

What accounts for the larger deflections shown in figure 2 as compared to figure 1?

• The mass is greater in figure 1

• The mass is greater in figure 2

• The positive charge is greater in Figure 1

• The positive charge is greater in figure 2

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NGSS.HS-PS2-1

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Why are the alpha particles passing straight through?

• The electrons are too small to stop them.

• There is no positive charge to deflect them.

• The positive charge is too scattered to deflect them.

• The blob looks like a meatball.

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NGSS.HS-PS1-8

Who's model is this?

• Millikan

• Rutherford

• Thomson

• Dalton

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.

Tags

NGSS.HS-PS1-8

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 that couldn't be divided. 
• He discovered that atoms had nuclei. 
• He discovered that atoms could be divided into smaller parts. 

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NGSS.MS-PS1-1

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

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NGSS.HS-PS1-8