Discovery of the Atom

Who came up with this model of an atom?

• J.J. Thompson

• Ernest Rutherford

• Neils Bohr

• James Chadwick

The majority of an atom's mass exists where?

• In the nucleus

• In the electron cloud

• In the space between the nucleus and the electrons

• In the neutrons

What did Rutherford's Gold Foil experiment prove?

• the atom is mostly space

• the atom is dense

• atoms don't exist

• atoms only consist of protons and electrons

He proposed the particle theory of matter and called nature’s most basic particle the “atomos”

• Aristotle

• Democritus

• Chadwick

• Millikan

What scientist first developed 4 rules for atomic theory, and helped kick start modern chemistry?

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

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Niels Bohr suggested that electrons.......

• are found in specific orbits

• electrons are scattered throughout the atom

• electrons move according to their energy level

• electrons are positive

Whose model of an atom is displayed in the picture?

• Thomson

• Rutherford

• Dalton

• Bohr

Why has the model of an atom changed over time?

• Scientists discovered new information about atoms over time.

• Scientists couldn't agree on what the atom looked like.

• Atoms today are different than they were for Democritus in Greece.

• Atoms are always changing and may be different in the future.

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This model of the atom described atoms as tiny spheres that could not be broken down into smaller pieces.

• Dalton's model of the atom

• The "Plum Pudding Model" of the atom

• The Nuclear Model

• The Bohr Model

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Who used the Gold Foil Experiment?

• Rutherford

• Democritus

• Aristotle

• Bohr