1. 1 Chapter 3 Atoms and Elements 3.3 The Periodic Table Copyright © 2009 by Pearson Education, Inc.

2. 2 Groups and Periods On the periodic table, elements are arranged according to similar properties. groups contain elements with similar properties in vertical columns. periods are horizontal rows of elements.

3. 3 Groups and Periods Copyright © 2009 by Pearson Education, Inc.

4. 4 Periodic Table

5. 5 Group Numbers use the letter A for the representative elements (1A to 8A) and the letter B for the transition elements. also use numbers 1-18 to the columns from left to right.

6. 6 Names of Some Representative Elements

7. 7 Alkali Metals Group 1A (1), the alkali metals, includes lithium, sodium, and potassium. Copyright © 2009 by Pearson Education, Inc.

8. 8 Halogens Group 7A (17), the halogens, includes chlorine, bromine, and iodine. Copyright © 2009 by Pearson Education, Inc.

9. 9 Identify the element described by the following: A. Group 7A (17), Period 4 1) Br2) Cl3) Mn B. Group 2A (2), Period 3 1) beryllium2) boron 3) magnesium C. Group 5A (15), Period 2 1) phosphorus 2) arsenic3) nitrogen Learning Check

10. 10 A. Group 7A (17), Period 4 1) Br B. Group 2A (2), Period 3 3) magnesium C. Group 5A (15), Period 2 3) nitrogen Solution

11. 11 Metals, Nonmetals, and Metalloids The heavy zigzag line separates metals and nonmetals. Metals are located to the left. Nonmetals are located to the right. Metalloids are located along the heavy zigzag line between the metals and nonmetals.

12. 12 Metals, Nonmetals, and Metalloids on the Periodic Table

13. 13 Metals are shiny and ductile. are good conductors of heat and electricity. Nonmetals are dull, brittle, and poor conductors. are good insulators. Metalloids are better conductors than nonmetals, but not as good as metals. are used as semiconductors and insulators. Properties of Metals, Nonmetals, and Metalloids

14. 14 Comparing a Metal, Metalloid, and Nonmetal

15. 15 Identify each of the following elements as 1) metal, 2) nonmetal, or 3) metalloid. A. sodium____ B. chlorine____ C. silicon ____ D. iron____ E. carbon____ Learning Check

16. 16 Identify each of the following elements as 1) metal, 2) nonmetal, or 3) metalloid. A. sodium1 metal B. chlorine2 nonmetal C. silicon 3 metalloid D. iron1 metal E. carbon2 nonmetal Solution

17. 17 Match the elements to the description. A. Metals in Group 4A (14) 1) Sn, Pb 2) C, Si 3) C, Si, Ge, Sn B. Nonmetals in Group 5A (15) 1) As, Sb, Bi 2) N, P3) N, P, As, Sb C. Metalloids in Group 4A (14) 1) C, Si, Ge, 2) Si, Ge 3) Si, Ge, Sn, Pb Learning Check

18. 18 Match the elements to the description. A. Metals in Group 4A (14) 1) Sn, Pb B. Nonmetals in Group 5A (15) 2) N, P C. Metalloids in Group 4A (14) 2) Si, Ge Solution