6A Review Atomic Theory

Who suggested the first atomic theory around 400 BC?

• John Dalton

• Democritus

• Ernest Rutherford

• Niels Bohr

Which scientist is credited for discovering the electron?

• Ernest Rutherford

• Niels Bohr

• James Chadwick

• J.J. Thompson

What did J.J. Thompson's Plum Pudding model suggest about the placement of electrons and protons in the atom?

• They were randomly placed throughout the atom

• They were located in the nucleus

• They were orbiting the nucleus

• They were in fixed energy levels

What did Ernest Rutherford's experiment with alpha particles and gold foil lead to the discovery of?

• The existence of protons

• The concept of quantum levels

• The structure of the nucleus

• The behavior of electrons

According to Niels Bohr's theory, how did electrons orbit around the nucleus?

• In a straight line

• In a circular path

• In seven different quantum levels

• In a random pattern

What did Niels Bohr use to imply his theory of electrons orbiting in different quantum levels?

• The discovery of the nucleus

• The Plum Pudding model

• The existence of protons

• The measurement of the line spectrum given off by each of the electrons

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How did Erwin Schrödinger view electrons in his wave mechanics model?

• As discrete particles

• As continuous clouds

• As orbiting the nucleus

• As existing in fixed energy levels

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What did Erwin Schrödinger develop that is used today to understand atoms and molecules?

• The Modern Atomic Theory

• The Plum Pudding model

• The concept of quantum levels

• The wave equation

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What did John Dalton's experiments with the proportions of hydrogen to oxygen in different substances lead to?

• The theory of atoms bonding in definite proportions

• The concept of quantum levels

• The Modern Atomic Theory

• The discovery of the nucleus

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What did Democritus suggest about the composition of all things?

• They are made up of protons and electrons

• They are composed of minute, invisible, indestructible particles of pure matter

• They are continuously moving in infinite empty space

• They are composed of fixed energy levels