Chapter 3 Atomic Structure: Images of the Invisible Invisible
Chapter 3 Atomic Structure: Images of the Invisible Copyright © 2010 Pearson Education, Inc. Experiments by J. J. Thomson showed that cathode rays are composed of what elementary particles? a. b. c. d. Protons Electrons Neutrons Alpha particles e. Positrons Copyright © 2010 Pearson Education, Inc. Experiments by J. J. Thomson showed that cathode rays are composed of what elementary particles? a. b. c. d. Protons Electrons Neutrons Alpha particles e. Positrons Copyright © 2010 Pearson Education, Inc. A helium nucleus that is emitted during some radioactive decay processes is also called a(n): a. b. c. d. e. Copyright © 2010 Pearson Education, Inc. Alpha particle Beta particle Gamma particle Delta particle Sigma particle A helium nucleus that is emitted during some radioactive decay processes is also called a(n): a. b. c. d. e. Copyright © 2010 Pearson Education, Inc. Alpha particle Beta particle Gamma particle Delta particle Sigma particle Which of these electronic transitions would result in the emission of visible light (where n = energy level)? a. b. c. d. e. Copyright © 2010 Pearson Education, Inc. n = 5 to n = 2 n = 2 to n = 5 n = 3 to n = 1 n = 7 to n = 3 n = 4 to n = 1 Which of these electronic transitions would result in the emission of visible light (where n = energy level)? a. b. c. d. e. Copyright © 2010 Pearson Education, Inc. n = 5 to n = 2 n = 2 to n = 5 n = 3 to n = 1 n = 7 to n = 3 n = 4 to n = 1 Isotopes are elements that differ only in their: a. Atomic number b. Nuclear charge c. Number of electrons in the neutral atom d. Atomic mass e. Chemical properties Copyright © 2010 Pearson Education, Inc. Isotopes are elements that differ only in their: a. Atomic number b. Nuclear charge c. Number of electrons in the neutral atom d. Atomic mass e. Chemical properties Copyright © 2010 Pearson Education, Inc. How many valence electrons does chlorine have? a. b. c. d. e. 8 7 6 5 4 Copyright © 2010 Pearson Education, Inc. How many valence electrons does chlorine have? a. b. c. d. e. 8 7 6 5 4 Copyright © 2010 Pearson Education, Inc. Elements in the same group of the periodic table exhibit what tendency? a. b. c. d. e. Similar chemical properties and reactivity The same total number of electrons Similar atomic masses Similar appearances and physical properties Different numbers of valence electrons Copyright © 2010 Pearson Education, Inc. Elements in the same group of the periodic table exhibit what tendency? a. b. c. d. e. Similar chemical properties and reactivity The same total number of electrons Similar atomic masses Similar appearances and physical properties Different numbers of valence electrons Copyright © 2010 Pearson Education, Inc.
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