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Constructed Response . Topic 3: Atomic Structure
Set F: Isotopes, valence electrons, ground state, number of subatomic particles
Base your answers to questions 15 through 17 on the information below.
Two isotopes of potassium are K – 37 and K – 42.
Write your answers here.
15. Explain, in terms of subatomic particles, why 15.
K – 37 and K – 42 are isotopes of potassium.
16. Ho w many valence electrons are in an atom 16.
of K – 42 in the ground state?
17. What is the total number of neutrons in the 17.
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nucleus of a K – 37 atom.
Set G: Excited state, electron transition, bright line spectrum
Base your answers to questions 18 and 19 on the diagram below, which shows bright-line spectra of
selected elements.
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Write your answers here.
18. Explain, in terms of excited state, energy transition, 18.
and ground state, how a bright-line spectrum is
produced.
19. Identify the two elements in the unknown spectrum. 19.
Set H: Bohr’s atomic model, electron shells, electron configuration, ground and excited state
Base your answers to questions 20 and 21 on the diagram below, which represents an atom of
magnesium-26 in the ground state.
Mg – 26 nucleus . 2 8 2
Write your answers here.
20. Write an appropriate number of electrons in each shell 20.
to represent a Mg – 26 atom in an excited state.
Your answer may include additional shells.
21. What is the total number of valence electrons in an atom 21.
of Mg-26 in the ground state.
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 373
Set F: Isotopes, valence electrons, ground state, number of subatomic particles
Base your answers to questions 15 through 17 on the information below.
Two isotopes of potassium are K – 37 and K – 42.
Write your answers here.
15. Explain, in terms of subatomic particles, why 15.
K – 37 and K – 42 are isotopes of potassium.
16. Ho w many valence electrons are in an atom 16.
of K – 42 in the ground state?
17. What is the total number of neutrons in the 17.
Teacher Preview Copy
nucleus of a K – 37 atom.
Set G: Excited state, electron transition, bright line spectrum
Base your answers to questions 18 and 19 on the diagram below, which shows bright-line spectra of
selected elements.
Teacher Preview Copy
Write your answers here.
18. Explain, in terms of excited state, energy transition, 18.
and ground state, how a bright-line spectrum is
produced.
19. Identify the two elements in the unknown spectrum. 19.
Set H: Bohr’s atomic model, electron shells, electron configuration, ground and excited state
Base your answers to questions 20 and 21 on the diagram below, which represents an atom of
magnesium-26 in the ground state.
Mg – 26 nucleus . 2 8 2
Write your answers here.
20. Write an appropriate number of electrons in each shell 20.
to represent a Mg – 26 atom in an excited state.
Your answer may include additional shells.
21. What is the total number of valence electrons in an atom 21.
of Mg-26 in the ground state.
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 373
