Directed Reading A. Section: Arranging the Elements DISCOVERING A PATTERN. Skills Worksheet

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1 Skills Worksheet Directed Reading A Section: Arranging the Elements DISCOVERING A PATTERN Write the letter of the correct answer in the space provided. 1. How did Dmitri Mendeleev, the Russian chemist, arrange the elements? a. in order of increasing density b. in order of increasing melting point c. in order of increasing shine d. in order of increasing atomic mass Periodic Properties of the Elements 2. What does periodic mean? a. occurs or repeats at regular intervals b. occurs almost never c. occurs only once d. occurs once or twice 3. Mendeleev s pattern repeated after how many elements? a. every two elements b. every three elements c. every seven elements d. every five elements 4. What did Mendeleev s table become known as? a. the periodic graph of the elements b. the periodic table of the elements c. the table of periodic elements d. the chart of periodic elements Predicting Properties of Missing Elements (pp ) 5. How did Mendeleev predict the properties of missing elements? a. by making the properties up b. by ignoring the properties of found elements c. by using the pattern he found d. by not following the pattern Holt California Physical Science 77 The Periodic Table

2 CHANGING THE ARRANGEMENT 6. Which of the following did the British scientist Henry Moseley determine? a. the atomic number of an atom b. the atomic mass of an atom c. the number of atoms in a proton d. the periodic table of elements 7. How are the elements arranged horizontally on the periodic table? a. by similar chemical properties b. by atomic mass c. in order of increasing atomic number d. in order of decreasing atomic number PERIODIC TABLE OF THE ELEMENTS 8. Which of the following items is NOT included in each square of the periodic table in your text? a. atomic number b. chemical symbol c. melting point d. atomic mass 9. On the periodic table in your text, what color indicates an element is a solid? a. red b. blue c. green d. yellow THE PERIODIC TABLE AND CLASSES OF ELEMENTS Use the terms from the following list to complete the sentences below. nonmetals semimetals metals periodic table 10. Most of the elements in the are metals. 11. More than half of the are gases at room temperature. 12. All are good conductors of electric current. 13. Metalloids are also called. Holt California Physical Science 2 The Periodic Table

3 DECODING THE PERIODIC TABLE Chemical Symbols Use the terms from the following list to complete the sentences below. chemical symbol californium mendelevium 14. Some elements, such as, are named after scientists. 15. Some elements, such as, are named after places. 16. For most elements, the has one or two letters, the first of which is always capitalized. Periods Write the letter of the correct answer in the space provided. 17. What is each horizontal row of elements on the periodic table called? a. a group b. a period c. a family d. a property 18. In what direction do you read periods? a. from top to bottom b. from bottom to top c. from left to right d. from right to left 19. What kind of pattern do properties of elements in a row follow? a. a musical pattern b. a square pattern c. a repeating, or periodic, pattern d. a star-shaped pattern Groups 20. What is another name for a group of elements? a. a period b. a family c. an element d. an electron 21. Which of the following elements usually have similar properties? a. elements in a period b. elements in a group c. elements with the same color d. elements in a horizontal row Holt California Physical Science 3 The Periodic Table

4 Atomic Number 22. How many of the recently discovered elements follow the periodic law? a. half of them b. none of them c. every fifth element d. all of them 23. What does the periodic law say about the properties of elements? a. They change periodically with the atomic numbers of the elements. b. They change periodically with the atomic mass of the elements. c. They change periodically with the mass number of the elements. d. They change periodically when the compound changes. 24. Where is the atomic number found for each element on the periodic table in your book? a. to the left of the chemical symbol of each element b. to the right of the chemical symbol of each element c. below the chemical symbol of each element d. above the chemical symbol of each element 25. What are isotopes? a. atoms that have the same number of protons but different numbers of electrons b. atoms that have the same number of protons but different numbers of neutrons c. atoms that have the same number of protons but different numbers of nuclei d. atoms that have the same number of electrons but different numbers of nuclei Holt California Physical Science 4 The Periodic Table

5 TEACHER RESOURCES Answer Key Directed Reading A SECTION: ARRANGING THE ELEMENTS 1. D 2. A 3. C 4. B 5. C 6. A 7. C 8. C 9. A 10. periodic table 11. nonmetals 12. metals 13. semimetals 14. mendelevium 15. californium 16. chemical symbol 17. B 18. C 19. C 20. B 21. B 22. D 23. A 24. D 25. B SECTION: GROUPING THE ELEMENTS 1. C 2. D 3. B 4. A 5. D 6. D 7. B 8. A 9. C 10. A 11. C 12. aluminum 13. metal 14. boron 15. oxygen 16. nonmetal 17. carbon 18. silicon 19. tin 20. B 21. D 22. A 23. B 24. C 25. C 26. A 27. B 28. B 29. C 30. C 31. A 32. C Directed Reading B SECTION: ARRANGING THE ELEMENTS 1. Answers may vary. Sample answer: Scientists might have been frustrated because the elements weren t organized, and therefore their properties couldn t be predicted. 2. D 3. periodic 4. periodic 5. Mendeleev was able to predict the properties of unknown elements by using the pattern of properties in the periodic table. 6. D 7. A 8. C 9. Chemical symbols are color coded on the periodic table according to the element s physical state at room temperature. The color of the chemical symbol for carbon is red, which corresponds to a solid. 10. properties 11. electrons 12. Answers may vary. Sample answer: The zigzag line can help me recognize which elements are metals, which are nonmetals, and which are metalloids. 13. metals 14. solid 15. mercury 16. nonmetals 17. metalloids Holt California Physical Science 103 The Periodic Table