Atomic Models

How do scientists know how atoms are structured?

• By looking at them under a microscope

• By running experiments that expose their properties

• By examining only the largest atoms

• By splitting them apart

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NGSS.MS-PS1-1

The electron cloud model is a 3-d model

• True

• False

What subatomic particles make up the nucleus of an atom? (Pick 2 particles)

• electrons

• Protons

• mesons

• molecules

• Neutrons

Tags

NGSS.MS-PS1-1

According to the latest atomic models, what do electrons do?

• They orbit around the nucleus

• They stay still inside the nucleus

• Electrons don't exist

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NGSS.MS-PS1-1

What does the nucleus of an atom contain?

• Electrons & Neutrons

• Protons & Neutrons

• Neutrinos & Positrons

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NGSS.MS-PS1-1

Who was the first to propose that matter consist of indivisible particle of matter called atoms?

• John Dalton

• Aristotle

• Democritus

• Plato

What are electrons?

• an atom’s central regions, which is made up of protons and neutrons

• subatomic particles that have negative charges

• subatomic particles that have neutral charges

• subatomic particles that have positive charges

Tags

NGSS.MS-PS1-1

Whose model suggested that negative particles were mixed in with positively charged material - like seeds in a watermelon?

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• Albert Einstein

Place the following atomic models in order, from earliest to latest:

A) Rutherford B) Thomson C) Dalton

• B, C, A

• C, A, B

• A, C, B

• C, B, A

Who discovered that the atom had an small, dense, positively charged center?

• Ernest Rutherford

• J.J Thomson

• Robert Millikan

• John Dalton

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NGSS.HS-PS1-8