TOPIC: Metals vs Nonmetals Do Now: Take three different crayons

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
Classifying the Elements
• 2/3 (67%) of elements are metals
• Remaining elements: non-metals & metalloids
• Metalloids:
– some properties of metals & some properties of
• Staircase:
– dividing line between metals & nonmetals
– elements to left are metals (except H)
– elements to right are non-metals
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
So…metals don’t want electrons,
they want to get rid of them
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
So…nonmetals love electrons, they
want to take electrons
Properties of Metalloids
6 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
Most elements are solid at room
– Elements that are gases at STP
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)
• 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