electricity3) Malleable & ductile4) Low ionization energy & low
electronegativity5) High mp, high bp & low vapor
pressure
Why do atoms form bonds?
To get the same electron configuration as the nearest noble gas.
What is a chemical bond?
Force of attraction that holds 2 atoms together.
What are the properties of ionic compounds?
1) Hard, brittle2) High melting point, high boiling point3) Low vapor pressure4) Poor conductors of heat5) Solids do not conduct electricity at all6) Melts & solutions do conduct a current7) Ions in solution react quickly
What is the structure of ionic compounds?
Crystal lattice: lattice points are positive &
negative ions.
Empirical Formula
Subscripts in chemical formula have smallest
whole number ratio
Empirical Formula
Ionic compounds only have empirical
formulas.
Crystal lattice
Regular, repeating pattern in 3 dimensions.
Compounds are electrically …
Neutral.
Molecular Formula
Gives exact composition of molecule.
What is the structure of metals.
Crystal lattice: all lattice points are
positive ions.
Delocalized electrons
Valence electrons in metals are free to
roam throughout the metal.
Sea of mobile electrons
Phrase used to describe valence electrons in
metallic bonding.
Subscripts in chemical formulas
Microscopic scale – give atomic ratios
Macroscopic scale – give mole ratios
Lewis Dot Structures for Ionic Compounds
Have square brackets and charges. Charges add up to 0. Positive ion has no dots. Negative ion has 8 dots.
Group 1 metals form …
+1 ions
Group 2 metals form …
+2 ions
Group 16 nonmetals form …
-2 ions
Group 17 nonmetals form …
-1 ions
Group 18 nonmetals form …
They don’t form ions. There the
noble gases!
NaCl
Binary Ionic Cmpd.Na has only 1 oxidation
state.Sodium Chloride
FeCl2
Binary Ionic Cmpd.Fe has 2 possible oxidation states.Iron (II) chloride
Names
Words & Roman Numerals
Formulas
Symbols & Subscripts
Fe(NO3)3
Contains a polyatomic.Fe has 2 possible oxidation states.Iron (III) Nitrate