Understanding Atomic Theory and Structure

Who proposed the plum pudding model of the atom?

• John Dalton

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

Tags

DOK Level 1: Recall

FL.SC.912.P.8.3.

Which subatomic particle has a positive charge?

• Electron

• Neutron

• Proton

• Photon

Tags

DOK Level 1: Recall

FL.SC.912.P.8.4.

Describe the main difference between the atomic models proposed by Thomson and Rutherford.

• Thomson's model included a nucleus, while Rutherford's did not.

• Rutherford's model included a nucleus, while Thomson's did not.

• Both models included a nucleus, but Rutherford's model had electrons in fixed orbits.

• Thomson's model had electrons in fixed orbits, while Rutherford's did not.

Tags

DOK Level 2: Skill/Concept

FL.SC.912.P.8.3.

Explain why Rutherford's gold foil experiment was significant in the development of atomic theory.

• It proved that atoms are indivisible.

• It showed that electrons are located in a cloud around the nucleus.

• It demonstrated that atoms have a small, dense nucleus.

• It confirmed the existence of neutrons.

Tags

DOK Level 2: Skill/Concept

FL.SC.912.P.8.3.

Given the atomic number of an element is 11 and its mass number is 23, calculate the number of neutrons in the atom.

• 11

• 12

• 23

• 34

Tags

DOK Level 2: Skill/Concept

FL.SC.912.P.8.4.

Analyze how the discovery of the neutron contributed to changes in the atomic model.

• It led to the realization that atoms are mostly empty space.

• It explained the existence of isotopes and their varying masses.

• It showed that electrons are located in specific energy levels.

• It confirmed that atoms are indivisible.

Tags

DOK Level 3: Strategic Thinking

FL.SC.912.P.8.3.

Compare and contrast the masses and charges of protons, neutrons, and electrons.

• Protons and neutrons have similar masses, while electrons are much lighter; protons are positively charged, neutrons are neutral, and electrons are negatively charged.

• Protons and electrons have similar masses, while neutrons are much heavier; protons are positively charged, neutrons are neutral, and electrons are negatively charged.

• Neutrons and electrons have similar masses, while protons are much heavier; protons are positively charged, neutrons are neutral, and electrons are negatively charged.

• Protons, neutrons, and electrons all have similar masses; protons are positively charged, neutrons are neutral, and electrons are negatively charged.

Tags

DOK Level 3: Strategic Thinking

FL.SC.912.P.8.4.

Evaluate the impact of experimental evidence on the evolution of atomic models from Dalton to Bohr.

• Experimental evidence had little impact; the models were based on philosophical ideas.

• Experimental evidence led to the refinement and replacement of models as new discoveries were made.

• Experimental evidence only supported Dalton's model, and later models were speculative.

• Experimental evidence disproved all atomic models until the modern quantum model.

Tags

DOK Level 3: Strategic Thinking

FL.SC.912.P.8.3.

What was the main conclusion of J.J. Thomson's cathode ray tube experiment?

• Atoms are indivisible.

• Atoms contain negatively charged particles called electrons.

• Atoms have a small, dense nucleus.

• Atoms are mostly empty space.

Which scientist is credited with the discovery of the neutron?

• John Dalton

• J.J. Thomson

• Ernest Rutherford

• James Chadwick