1. Aim: What are the 3 classes of elements?
Do Now:
1. Pass down HW.
2. Take out a PEN and put everything away.

2. Review 1.Metals Alkali Metals Alkaline Earth Metals Transition Metals
Inner Transition Metals
2.Metalloids
3.Nonmetals
Halogen
Noble Gases

5. Alkali Metals and Alkaline Earth Metal
Alkaline Earth Metals
Group 1
Most active metals in the periodic table
All react vigorously with water to produce H2(g)
They are shiny, have the consistency of clay, and are easily cut with a knife.
Reactivity increases as you go down this group
Group 2
Second most active metals
**Note: Hydrogen is a nonmetal**

6. Sodium + Water

8. Transition Metals and Inner Transition Metals
The elements in Groups 3 through 12
Typically hard solids with high melting points, with the exception of mercury
Form colored compounds.
Are good conductors of heat and electricity.
Can be hammered or bent into shape easily.(malleable)
Are less reactive than alkali metals such as sodium.

9. Transition Metals in Compounds

11. Metalloids
They can be found adjacent to the stair-step line in the periodic table.
Have physical properties similar to those of metals and chemical properties nonmetals.
Solids
Can be shiny or dull
Ductile
Malleable
Conduct heat and electricity better than nonmetals but not as well as metals

12. Metalloids Cont.
boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), and polonium (Po) are the elements found along the step like line between metals and non-metals of the periodic table.
HIGHLIGHT YOUR METALLOIDS. THEY SEPARATE YOUR METALS AND NONMETALS

14. Halogens
Group 17
Halogens have 7 valence electrons, which explains why they are the most active non-metals
Have low melting points and boiling points
Chemical reactivity decreases as you go down the group
Form diatomic molecules

15. Properties of Halogens
Reactivity decreases as you go down a group.

18. Noble Gases Group 18 Colorless gases
Do not chemically react with other elements (inert or stable) because of full outer shell
Are monoatomic

20. Metallic Character
The metallic character of an element can be defined as how readily an atom can lose an electron.
Metallic characteristics decrease from left to right across a period, and  increase down a group.