Unit 2, Lesson 2.7 - Periodic Table

1. Periodic Table (Unit Two, Lesson 2.7) By Margielene D. Judan

2. Lesson Outline: The Periodic Table Periods and Groups

3. THE PERIODIC TABLE The tabular arrangement of the chemical elements It is called periodic because it exhibits a periodicity (cycle) in the properties of elements. There are 115 elements, 92 occur naturally while others are artificially made.

4. THE PERIODIC TABLE They are arranged based on their atomic number Atomic number the # of protons present in an element

5. THE PERIODIC TABLE Developed by Russian chemist, Dmitri Mendeleev

6. GROUPS AND PERIODS Groups vertical arrangement Period horizontal arrangement Elements along a group and period exhibit some similarities in their properties

7. GROUPS AND PERIODS Look at your periodic table: For example, group VIIA or 17 are called halogens. They are called salt- formers because compounds containing halogens are classified as salts. (ex. NaCl, CaCl2, MgI2)

8. GROUPS AND PERIODS Look at your periodic table: On the leftmost side, there are the periods from 1 to 7.

9. Finding the location based on groups and periods Group first, then period. For example: Oxygen is in group VIA or 16, period 2 (G6A, P2 or G16,P2)

10. Examples: Phosphorus (P) G.5A,P.3 or G.15,P.3

11. Examples: Gold (Au) G.1B,P.6 or G.11,P.6

12. Find the location of the following elements using your periodic table 1. Molybdenum (Mo) 2. Lanthanum (La) 3. Krypton (Kr) 4. Tungsten (W) 5. Carbon (C)

13. Find the location of the following elements using your periodic table 1. Molybdenum (Mo) G.6B,P.5 or G.6,P.5 2. Lanthanum (La) G.3B,P.6 or G.3,P.6 3. Krypton (Kr) G.8A,P.4 or G.18,P.4 4. Tungsten (W) G.6B,P.6 or G.6,P.6 5. Carbon (C) G.4A,P.2 or G.14,P.2

14. Quiz Tomorrow: Memorize the abbreviations of the elements of the f-block only

15. Sources: Science Links 7