Chapter 2 - Chapter 2: Atoms, Molecules, and Ions A...

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Page 23 Chapter 2: Atoms, Molecules, and Ions A periodic table is required to work many of the problems in this chapter. 1. In a cathode ray tube A) electrons pass from the anode to the cathode. B) electrons pass from the cathode to the anode. C) protons pass from the anode to the cathode. D) protons pass from the cathode to the anode. Ans: B Category: Medium Section: 2.2 2. The elements in a column of the periodic table are known as A) metalloids. B) a period. C) noble gases. D) a group. E) nonmetals. Ans: D Category: Easy Section: 2.4 3. Which of the following elements is most likely to be a good conductor of electricity? A) N B) S C) He D) Cl E) Fe Ans: E Category: Easy Section: 2.4 4. An anion is defined as A) a charged atom or group of atoms with a net negative charge. B) a stable atom. C) a group of stable atoms. D) an atom or group of atoms with a net positive charge. Ans: A Category: Easy Section: 2.5 5. The scientist who determined the magnitude of the electric charge of the electron was A) John Dalton. D) Henry Moseley. B) Robert Millikan. E) R. Chang. C) J. J. Thomson. Ans: B Category: Easy Section: 2.2 6. When J. J. Thomson discovered the electron, what physical property of the electron did he measure? A) its charge, e D) its mass, m B) its charge-to-mass ratio, e/m E) its atomic number, Z C) its temperature, T Ans: B Category: Easy Section: 2.2 7. Which of the following scientists developed the nuclear model of the atom? A) John Dalton D) Henry Moseley B) Robert Millikan E) Ernest Rutherford C) J. J. Thomson Ans: E Category: Easy Section: 2.2
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Chapter 2: Atoms, Molecules, and Ions Page 24 8. Rutherford's experiment with alpha particle scattering by gold foil established that A) protons are not evenly distributed throughout an atom. B) electrons have a negative charge. C) electrons have a positive charge. D) atoms are made of protons, neutrons, and electrons. E) protons are 1840 times heavier than electrons. Ans: A Category: Medium Section: 2.2 9. Atoms of the same element with different mass numbers are called A) ions. B) neutrons. C) allotropes. D) chemical families. E) isotopes. Ans: E Category: Easy Section: 2.3 10. How many neutrons are there in an atom of uranium whose mass number is 235? A) 92 B) 143 C) 235 D) 238 E) 327 Ans: B Category: Easy Section: 2.3 11. How many protons are there in an atom of uranium whose mass number is 235? A) 92 B) 143 C) 235 D) 238 E) 327 Ans: A Category: Easy Section: 2.3 12. An atom of the isotope chlorine-37 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron) A) 17 p, 18.45 n, 17 e D) 17 p, 37 n, 17 e B) 17 p, 20 n, 7 e E) 20 p, 17 n, 20 e C) 17 p, 20 n, 17 e Ans: C Category: Medium Section: 2.3 13. Give the number of protons (p), electrons (e), and neutrons (n) in one atom of nickel-62.
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Chapter 2 - Chapter 2: Atoms, Molecules, and Ions A...

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