1. Periodic Table/Elements August 16
How many significant figures does have?
How many significant figures should the product of 10.3 x 2.3 have?
[10 (power 4) (power 3) ] ÷ 10 (power ­2)

2. Elements

4. 73% Hygrogen
25% Helium
2% everything else

6. Elements Periodic Table of the Elements
The vertical columns of the periodic table are called groups, or families
Each group contains elements with similar chemical properties
The horizontal rows of elements in the periodic table are called periods
Physical and chemical properties change somewhat regularly across a period

7. Elements Types of Elements
Metal is an element that is a good electrical conductor and a good heat conductor
Properties of metals
Most are solids at room temperature
Malleable - they can be hammered or rolled into thin sheets
Ductile - they can be drawn into a fine wire
Conduct electricity and heat well

8. Alkali Metals:Group 1 in the periodic table.
-soft, white, low-density, low-melting point
-highly reactive metallic elements
-lithium, sodium, potassium, rubidium, cesium, and francium.
-one electron in the outermost energy level
-never found free in nature.

9. Periodic Table/Elements August 17
How many significant figures does have?
How many significant figures should the product of x have?
[10 (power 4) (power 4) ] x 10 (power 2)

10. Alkaline Earth Metals: Group 2 in the periodic table.
-metallic elements
calcium, strontium, magnesium, and barium, but generally including beryllium and radium.
-two electrons in the outermost energy level, readily reactive
-never found free in nature.

11. Transition Metals: Any of the metallic elements within Groups 3 to 12 in the periodic table
-multiple valences (outermost electron rings)

12. Elements
Types of Elements
Gold Copper Aluminum

13. Elements Types of Elements
Nonmetal is an element that is a poor conductor of heat and electricity
Properties of nonmetals
Many are gases
Solids are brittle
Poor conductors of heat and electricity

14. Elements
Types of Elements
Carbon Sulfur Phosphorus Iodine

15. Elements Types of Elements
Metalloid is an element that has some characteristics of metals and some characteristics of nonmetals
Properties of metalloids
All metalloids are solids at room temperature
Semiconductors of electricity

16. Halogens: Group 17 in the periodic table.
-five chemically related nonmetallic elements
-fluorine, chlorine, bromine, iodine, and astatine
-highly reactive and combine readily with most metals and nonmetals to form a variety of compounds
-never occur uncombined in nature.

17. Elements Types of Elements
Noble gases are the elements in Group 18 of the periodic table of the elements
Properties of noble gases
Generally unreactive
Gases at room temperature

18. Elements
Types of Elements

19. Lanthanide Metals: Elements representing atomic numbers 57–61 in the periodic table. They are shiny metals, similar in reactivity to alkaline earth metals.
Actinide Metals: A series of radioactive metallic elements in Group 3 of the periodic table.