KEY-FinalExamStudyGuide_Fall2013

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Name ___________________________ Date ___________________ Class __________________ 20. In the periodic table, the elements are organized into groups based on a ______________________________________________________________ set of repeating properties . The Periodic Table—A Preview (page 118) 21. What are the horizontal rows in the periodic table called? periods Reading Skill Practice Outlining can help you understand and remember what you have read. Prepare an outline of Section 4.3, Distinguishing Among Atoms. Begin with the headings in the textbook. Under each heading, write the main idea. Then list the details that support the main idea. Do your work on a separate sheet of paper. Main heads should be Atomic Number, Mass Number, Isotopes, and Atomic Mass. Subheads should indicate an understanding of each concept. © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. Chapter 4 Atomic Structure 39
Name ___________________________ Date ___________________ Class __________________ CHAPTER 4, Atomic Structure (continued) GUIDED PRACTICE PROBLEMS Fill in the write-on lines and boxes provided as you work through the guided practice problems. GUIDED PRACTICE PROBLEM 18 (page 112) 18. Use Table 4.2 to express the compositions of carbon-12, fluorine-19, and beryllium-9 in shorthand notation. Analyze Carbon-12 Step 1. The number of protons in an atom is called its ______________________ atomic number. The number of protons in an atom of carbon-12 is ___________ 6 . Calculate Step 2. The number of protons plus the number of neutrons in an atom is called its ______________________ mass number. For carbon-12, this number is ___________ 12 . Step 3. The shorthand notation for carbon-12 is: mass number 12 atomic number 6 Evaluate C Step 4. Except for hydrogen-1, the mass number of an isotope is always greater than its atomic number. Is the mass number reasonable? ____________ yes Fluorine-19 Step 1. The atomic number of fluorine-19 is ____________ 9 . Step 2. Its mass number is ____________ 19 . 19 Step 3. The shorthand notation for fluorine-19 is: 9 Step 4. Is your answer reasonable? Why? F © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. Yes it is, because the mass number is greater than the atomic number. 40 Guided Reading and Study Workbook
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KEY-FinalExamStudyGuide_Fall2013

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