p101chap18pretest

p101chap18pretest - Chapter 18 The Structure of the Atom 1...

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Chapter 18: The Structure of the Atom 1. For most elements, an atom has A. no neutrons in the nucleus. B. more protons than electrons. C. less neutrons than electrons. D. just as many electrons as protons. E. just as many neutrons as electrons. Answer: D 2. A true statement about atoms is that they A. can emit radiation only at specific frequencies. B. all have the same number of electrons. C. can emit radiation at any frequency. D. can emit radiation at frequencies only within the visible spectrum. Answer: A 3. The atomic number of an atom is the number of A. electrons in the nucleus. B. protons in the nucleus. C. sum of protons and electrons in the atom. D. neutrons in the nucleus. E. sum of protons and neutrons in the atom. Answer: B 4. The maximum number of electrons allowed in the n = 1 shell of sodium is A. 8. B. 6. C. 4. D. 2. E. unlimited. Answer: D 5. The periodic table is a systematic arrangement of A. all known molecules. B. those materials that are conductors. C. the non-radioactive elements. D. all known elements. Answer: D
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6. The principal characteristic that distinguishes one element from another is the A. number of protons is the nucleus. B. number of neutrons in the nucleus. C. combined number of protons and neutrons in the nucleus. D. number of variations in the electron configuration. E. size of the atom. Answer: A 7. A block of granite is mostly empty space because the atoms making up the granite are A. in perpetual motion. B. themselves mostly empty space. C. not as close together as they should be. D. held together by electrical forces. Answer: B 8. When an atom has an electron removed, then its net charge is A. unchanged. B. negative. C. positive. D. … it is impossible to remove an electron from an atom. Answer: C 9. When the electron loses its charge, then it A. becomes a neutron. . B. is still an electron but doesn’t have its charge. C. is now repelled by protons. D. becomes a photon. E. … it is impossible to remove a charge from an electron. Answer:
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p101chap18pretest - Chapter 18 The Structure of the Atom 1...

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