1. Periodic Table Of Elements

2. Understand the organization of the periodic table. Identify properties of metals and non-metals KEY WORDS Periodic tableFamilyPeriod Alkali metalsGroupChalcogens Noble gasesMetalliods Earth Metals HalogensNon-metals

4. Periodic Table contains metals and non-metals. A staircase separates metals from non-metals. M e t a l s Non- metals

5. Rows of the periodic table are called periods. Elements in periods do not have similar properties. From left to right : Elements go from metals to non-metals to gases. periods

6. A column is called a group. Elements in a group have similar chemical properties. A family is a group with a specific name. Alkali metals Alkaline Earth metals Chalogens Halogens Inert (noble) gases

7. METALS: Found on left hand side of staircase. Have less than 3 valence electrons. Conduct heat and electricity, shiny, solid at room temperature, need high melting temperatures. METALS

8. Alkali metal family: Group 1A. Each element has 1 valence electron. Soft, highly reactive metals. In nature – always combined with other elements. *

9. Alkaline Earth metals: Group 2A (IIA). Less reactive than Alkali family. Have 2 valence electrons.

10. Metalloids: Behave like metals and non-metals. Elements on the staircase. Transition Metals: Metals found in the short columns.

11. NON-METALS: Found on right of the staircase. Have 5 or more valence electrons. Low melting temperatures, usually gases or fragile solids at room temperature, poor conductors. Non- metals

12. Chalcogens: Group 6A (VI). Non-metals Less reactive than the halogen family. 6 valence electrons.

13. Halogens: Group 7A (VII). Poisonous and highly reactive non-metals. 7 valence electrons. Usually found combined with another element.

14. Noble (inert) gases: Group 8A (VIII). Elements are very stable non-metals – Unreactive 8 valence electrons. No natural compounds exist with these elements.

15. Hydrogen*: Considered a non-metal gas. Contains only 1 electron. Highly reactive. All hydrogen on Earth is combined with other materials or with itself.

16. Metals on the left – non-metals on the right. Group number indicates the number of valence electrons. Noble gases are unreactive with 8 valence electrons. Elements in a group have similar chemical properties.