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Unformatted text preview: Practice Questions for Chapters 1, 2, 3 1) In the term trace element, the modifier trace means A) the element is required in very small amounts. B) the element can be used as a label to trace atoms through an organism's metabolism. C) the element is very rare on Earth. D) the element enhances health but is not essential for the organism's long-term survival. E) the element passes rapidly through the organism. 2) Compared to 31 P, the radioactive isotope 32 P has A) a different atomic number. B) one more neutron. C) one more proton. D) one more electron. E) a different charge. 3) Atoms can be represented by simply listing the number of protons, neutrons, and electrons π for example, 2 p + ; 2 n ; 2 e- for helium. Which atom represents the 18 O isotope of oxygen? A) 6 p + ; 8 n ; 6 e- B) 8 p + ; 10 n ; 8 e- C) 9 p + ; 9 n ; 9 e- D) 7 p + ; 2 n ; 9 e- E) 1 0p + ; 8 n ; 10 e- 4) The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the electron configuration of sulfur, we can predict that the molecular formula ofhydrogen sulfide....
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- Spring '11