Exploring Modern Atomic Theory

Which of the following is a postulate of Dalton's Atomic Theory?

• Atoms are divisible into smaller particles.

• Atoms of the same element are identical in mass and properties.

• Atoms can be created or destroyed in chemical reactions.

• Atoms of different elements cannot combine to form compounds.

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DOK Level 1: Recall

What did J.J. Thomson discover about the electron?

• Electrons are located in the nucleus.

• Electrons have a positive charge.

• Electrons have a negative charge.

• Electrons have no charge.

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DOK Level 1: Recall

Describe the main feature of Rutherford's nuclear model of the atom.

• Electrons orbit the nucleus in fixed paths.

• The atom is a solid sphere.

• The nucleus is a small, dense, positively charged center.

• Electrons are embedded in a positively charged sphere.

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DOK Level 1: Recall

According to Bohr's atomic model, how do electrons move around the nucleus?

• In random orbits.

• In fixed orbits with specific energy levels.

• In a cloud around the nucleus.

• In a straight line.

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DOK Level 1: Recall

What does Heisenberg's Uncertainty Principle state?

• It is impossible to know both the position and momentum of an electron simultaneously with absolute precision.

• Electrons move in fixed orbits around the nucleus.

• Atoms are indivisible.

• Electrons have a positive charge.

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DOK Level 1: Recall

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DOK Level 2: Skill/Concept

Which of the following best describes the location of protons in an atom?

• In the electron cloud.

• In the nucleus.

• Orbiting the nucleus.

• In the outer shell.

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DOK Level 1: Recall

What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Variable

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DOK Level 1: Recall

Describe the relationship between the wavelength and frequency of light.

• They are directly proportional.

• They are inversely proportional.

• They are unrelated.

• They are equal.

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DOK Level 2: Skill/Concept

Which of the following statements is true about ions?

• Ions have the same number of protons and electrons.

• Ions have a different number of protons and neutrons.

• Ions have a different number of protons and electrons.

• Ions have a different number of neutrons and electrons.

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DOK Level 1: Recall