History of the Atoms

Democritus was known for

• discovering the electron

• discovering the proton

• creating the term atom, meaning indivisible

• discovering the nucleus

All matter is made of

• energy

• atoms

• electrons

• compounds

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NGSS.MS-PS1-1

Who is the scientist who proposed the "solar system" model of an atom where the electrons orbit around the nucleus?

• Democritus
• Niels Bohr
• Ernest Rutherford
• Chadwick

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NGSS.MS-PS1-1

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

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

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NGSS.MS-PS1-1

What did James Chadwick discover?

• neutrons
• electrons
• the atomic theory
• protons

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NGSS.HS-PS1-8

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

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

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NGSS.MS-PS1-1

Rutherford and his students did experiments that showed

• quark

• nucleus

• proton

• electron

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NGSS.MS-PS1-1

Bohr discovered that electrons are located in

• the nucleus

• inside protons

• electron cloud

• circular orbits around the nucleus

Who developed the Quantum Mechanical Model?

• Erwin Schrodinger
• Joseph Thomson
• James Chadwick
• Ernest Rutherford

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