October 15 th 2009. Objectives SWBAT Identify oxidation numbers for given ions SWBAT State the definition of electronegativity SWBAT explain electronegativity trends on the periodic table Catalyst
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2 different elements:
A chemical formula contains the number of each atom in the compound.Chemical Formula
If there is no number, it is an implied ONE
2 Na : 1 C : 3 O
Electronegativity decreases as you go down the periodic table and increases as you go left to right across the periodic table.
Radon, Strontium, Magnesium, Beryllium
Cl, Si, Al, S, P
Aluminum, Silicon, Phosphorus, Sulfur, Chlorine
Atomic size is indirectly related to electronegativity
As electronegativity increases, atomic size decreases!
High or low electronegativity?
Large or small atomic size?
Set A:Bh, Mn, Re, TcSet B:Sb, I, Ag, Ru
Set C: Y, Ti, Sg, Ta
Set A: Cl, At, I, F, Br Set B: Te, Xe, Sn, In
Set C:Rb, K, Sr, Ca
A. Fluorine, Barium, Francium, Helium, Arsenic