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1 Name: Class: Date: ID: A Chapter 5 Assessment Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Mendeleev arranged the elements in his periodic table in order of a. atomic number. c. mass. b. number of electrons. d. number of neutrons. 2. Mendeleev s decision to leave gaps in his periodic table was supported by the discovery of a. electrons. c. argon. b. protons. d. gallium. 3. In a modern periodic table, elements are arranged in order of a. atomic number. c. atomic mass. b. number of isotopes. d. number of neutrons. 4. How many periods does the periodic table have? a. 18 c. 9 b. 7 d An atomic mass unit is a. one twelfth the mass of a carbon- 12 c. the mass of a neutron. atom. b. the mass of a carbon- 12 atom. d. the mass of a proton. 6. An element that is shiny and conducts electric current is likely to be a a. gas. c. metalloid. b. metal. d. nonmetal. 7. Copper is an example of a. an alkali metal. c. a nonmetal. b. an alkaline earth metal. d. a transition metal. 8. Elements that have the same number of valence electrons are a. in the same period. c. called noble gases. b. in the same group. d. called transition metals. 9. The most reactive metals are the a. transition metals. c. alkali metals. b. alkaline earth metals. d. metalloids. 10. Which elements are all gases at room temperature? a. Group 1A c. Group 7A b. Period 3 d. Group 8A Short Answer 11. What information did Mendeleev have about the elements he organized into a periodic table? 1

2 Name: ID: A 12. How did Mendeleev know where to leave the spaces in his table? 13. Why is the table of the elements shown in Figure 7 called a periodic table? 14. Why is the table of elements vary from period to period? 15. Explain how the atomic mass of an element is affected by the distribution of its isotopes in nature. 16. List three ways that the elements in the periodic table can be classified. 17. In general, what happens to the reactivity of elements in groups labeled A as atomic numbers increase across a period? 18. Why don t the elements within an A group in the periodic table have identical properties? 19. Why was it difficult to discover the noble gases? 20. How many of the elements shown are metals? How many are nonmetals? How many are metalloids? 21. Which element is a liquid at room temperature and which is a gas at room temperature? 22. Which of the two halogens shown is more reactive? Give a reason for your answer. 23. Does selenium have more in common with sulfur or bromine? Explain your answer. Problem 24. If you know that an element is a solid at room temperature, do you have enough data to classify the element as a metal, metalloid, or nonmetal? If you know that the element is a gas at room temperature, do you have enough data? Explain your answers. 25. An element on the periodic table has two naturally occurring isotopes. One isotope has an atomic mass of about 10 amu. The other isotope has an atomic mass of about 11 amu. What is the name of this element? 2

3 Name: ID: A 26. How many valence electrons would an element with atomic number 113 have? 27. Why are samples of the alkali metal cesium usually stored in argon gas? 28. Why are halogens found in nature only in compounds? 29. Which element on the periodic table has chemical properties that are most similar to those of carbon? 30. If you were trying to make a compound of the noble gas xenon, would you use nitrogen or fluorine? Explain your choice. 3

4 ID: A Chapter 5 Assessment Answer Section MULTIPLE CHOICE 1. ANS: C 2. ANS: D 3. ANS: A 4. ANS: B 5. ANS: A 6. ANS: B 7. ANS: D 8. ANS: B 9. ANS: C 10. ANS: D SHORT ANSWER 11. ANS: Mendeleev knew their relative masses and properties. 12. ANS: Mendeleev placed elements in the groups where they logically belonged based on their properties. 13. ANS: The table is called a periodic table because the properties of the elements repeat at regular intervals from row to row. 14. ANS: The number of elements per period varies because the number of available orbitals increases as the energy level increases. 15. ANS: An atomic mass is a weighted average of the atomic masses of an element s isotopes. The distribution of the isotopes determines how much each isotope affects the weighted average. 16. ANS: Elements can be classified by their state at room temperature; by whether they exist in nature; and by whether they are metals, nonmetals, or metalloids. 1

5 ID: A 17. ANS: Across a period from left to right, metals become less reactive and nonmetals become more reactive, excluding the elements in Group 8A. 18. ANS: Elements in the same A group do not have identical properties because their valence electrons are in different energy levels. 19. ANS: The noble gases were difficult to discover because they are colorless, odorless, and very rarely react. 20. ANS: 0 metals, 5 nonmetals, and 3 metalloids. 21. ANS: Bromine is a liquid and chlorine is a gas. 22. ANS: Chlorine is more reactive than bromine because the reactivity of nonmetals increases from the bottom to the top of a group. 23. ANS: Selenium has more in common with sulfur because they are in the same group and have the same number of valence electrons. PROBLEM 24. ANS: There is not enough data for the solid because solids at room temperature can be metals, nonmetals, or metalloids. There is enough data for the gas because there are no gaseous metals or metalloids at room temperature. 25. ANS: Boron, with an atomic mass of

6 ID: A 26. ANS: Three 27. ANS: Cesium is an extremely reactive metal; argon is an extremely unreactive nonmetal. 28. ANS: Halogens are always found in nature in compounds because halogens are highly reactive nonmetals. 29. ANS: Silicon 30. ANS: You would choose fluorine because it is much more likely to react than nitrogen is. 3

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