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Constructed Response . Topic 3: Atomic Structure
Set A: Historical development of atom, historical experiments
John Dalton was an English scientist who proposed that atoms were hard, indivisible
spheres. In the modern model, the atom has a different internal structure.
Write your answers here.
1. Iden tify one experiment that led scientists to 1.
deve lop the modern model of the atom.
2. Describe this experiment. 2.
Teacher Preview Copy
Teacher Preview Copy
3. State one conclusion about the internal structure 3.
of th e atom, based on this experiment.
Set B: Historical development of modern atomic model, gold foil experiment
Base your answers to questions 4 through 6 on the information and diagram below.
One model of the atom states that atoms are tiny particles composed of a
uniform mixture of positive and negative charges. scientists conducted
experiment where alpha particles were aimed at a thin layer of gold atoms.
Most of the alpha particles passed directly through the gold atoms. A few alpha
particles were deflected from their straight-line paths. An illustration of the
experiment is shown below.
Write your answers here.
4. How should the original model be revised 4.
based on the results of this experiment?
5. A few of the alpha particles were deflected. 5.
What does this evidence suggests about the
structure of the gold atoms?
6. Most of the alpha particles passed directly 6.
through the gold atoms undisturbed.
What does this evidence suggest about
the structure of the gold atoms?
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 371
Set A: Historical development of atom, historical experiments
John Dalton was an English scientist who proposed that atoms were hard, indivisible
spheres. In the modern model, the atom has a different internal structure.
Write your answers here.
1. Iden tify one experiment that led scientists to 1.
deve lop the modern model of the atom.
2. Describe this experiment. 2.
Teacher Preview Copy
Teacher Preview Copy
3. State one conclusion about the internal structure 3.
of th e atom, based on this experiment.
Set B: Historical development of modern atomic model, gold foil experiment
Base your answers to questions 4 through 6 on the information and diagram below.
One model of the atom states that atoms are tiny particles composed of a
uniform mixture of positive and negative charges. scientists conducted
experiment where alpha particles were aimed at a thin layer of gold atoms.
Most of the alpha particles passed directly through the gold atoms. A few alpha
particles were deflected from their straight-line paths. An illustration of the
experiment is shown below.
Write your answers here.
4. How should the original model be revised 4.
based on the results of this experiment?
5. A few of the alpha particles were deflected. 5.
What does this evidence suggests about the
structure of the gold atoms?
6. Most of the alpha particles passed directly 6.
through the gold atoms undisturbed.
What does this evidence suggest about
the structure of the gold atoms?
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 371
