1. TOPIC: Metals vs Nonmetals Do Now: grab a lab up front and start filling in the symbols and atomic number for the elements Replace Calcium with Silicon and Manganese with Cadmium

2. Classifying the Elements
2/3 (67%) of elements are metals
Remaining elements: non-metals & metalloids (semi-metals)
Metalloids:
some properties of metals & some properties of nonmetals
Staircase:
dividing line between metals & nonmetals
elements to left are metals (except H)
elements to right are non-metals

4. Properties of Metals Malleable – flattened into sheets
Ductile – drawn into wires & tubes
have Luster
Good Conductors of heat & electricity
Solid at room temperature (except Hg)
Metals lose electrons & form positive ions “Metals are losers”
Most reactive metal is Fr
Most reactive family is Alkali Metals

5. So…metals don’t want electrons, they want to get rid of them

6. Properties of Nonmetals
generally gases or solids (except Br2)
solids are Brittle
solids are Dull
poor conductors of heat & electricity
Nonmetals gain electrons & form negative ions “Nonmetals are winners”
Most reactive nonmetal is F
Properties: OPPOSITE of metals

7. So…nonmetals love electrons, they want to take electrons

8. Properties of Metalloids
4 on right of staircase: B,Si,As,Te,
2 on left of staircase: Ge,Sb
Each metalloid has some metallic and some nonmetallic properties
Example:Si
shiny like metal but brittle like nonmetal

9. Most elements are solid at room temperature
GASES
Elements that are gases at STP Diatomics: H2, N2, O2, F2, Cl2
Monatomics: noble gases He, Ne, Ar, Kr, Xe, Rn
Liquids (only 2 at room temp.)
Br2 (non-metal) and Hg (metal)

10. Allotropes Different forms of element in same phase
different structures and properties
O2 and O3 - both gas phase
O2 (oxygen) - necessary for life
O3 (ozone) - toxic to life
Graphite, diamond:
both carbon in solid form