Exploring Atomic Theory and Models

Who is considered the first person to propose the idea of the atom as an indivisible particle?

• John Dalton

• Democritus

• Niels Bohr

• Ernest Rutherford

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DOK Level 1: Recall

Which scientist is associated with the plum pudding model of the atom?

• Niels Bohr

• J.J. Thomson

• Ernest Rutherford

• John Dalton

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DOK Level 1: Recall

What was the main discovery of Ernest Rutherford's gold foil experiment?

• Electrons are in fixed orbits

• Atoms are indivisible

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

• Atoms are mostly empty space

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DOK Level 2: Skill/Concept

Describe the key feature of Niels Bohr's atomic model.

• Electrons are embedded in a positively charged sphere

• Electrons orbit the nucleus in fixed paths

• Atoms are indivisible particles

• Electrons are scattered randomly around the nucleus

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DOK Level 2: Skill/Concept

Compare and contrast the atomic models proposed by J.J. Thomson and Ernest Rutherford.

• Both models suggest that electrons are in fixed orbits around the nucleus.

• Thomson's model suggests a uniform positive charge with embedded electrons, while Rutherford's model suggests a dense nucleus with electrons orbiting around it.

• Both models propose that the atom is mostly empty space.

• Thomson's model suggests a dense nucleus, while Rutherford's model suggests a uniform positive charge.

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DOK Level 3: Strategic Thinking

Which of the following statements best describes John Dalton's atomic theory?

• Atoms are made up of smaller particles called protons, neutrons, and electrons.

• Atoms are indivisible and indestructible particles.

• Atoms have a dense nucleus with electrons orbiting around it.

• Atoms are mostly empty space with a small, dense nucleus.

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DOK Level 1: Recall

What was the major limitation of Bohr's atomic model?

• It could not explain the stability of atoms.

• It could not explain the spectra of atoms with more than one electron.

• It did not include the concept of a nucleus.

• It suggested that atoms are indivisible.

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DOK Level 2: Skill/Concept

In a neutral atom, the number of electrons is equal to the number of _______.

• Neutrons
• Orbits
• Protons
• subatomic particles

What does the atomic number of an element represent?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The total number of protons and neutrons in the nucleus

• The total number of protons and electrons in an atom

What is the charge of a proton?

• Negative

• Positive

• Neutral

• Variable