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“electron sea” METALLIC Bond Formation Type of Structure Solubility in Water Electrical Conductivity Other Properties Melting Point A. Types of Bonds Physical State e - are delocalized among metal atoms very high yes (any form) no malleable, ductile, lustrous solid
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I II III IV
Unit 6 - Chemical Bonding
I. Introduction toBonding
IONIC COVALENTBond FormationType of Structure
Solubility in WaterElectrical ConductivityOtherProperties
e- are transferred from metal to nonmetal
high
yes (solution or liquid)
yes
e- are shared between two nonmetals
low
no
usually not
MeltingPoint
crystal lattice true molecules
A. Types of Bonds
Physical State solid liquid or gas
“electron sea”
METALLICBond FormationType of Structure
Solubility in WaterElectrical ConductivityOtherProperties
MeltingPoint
A. Types of Bonds
Physical State
e- are delocalized among metal atoms
very high
yes (any form)
no
malleable, ductile, lustrous
solid
B. VocabularyChemical Bond
electrical attraction between nuclei and valence e- of neighboring atoms that binds the atoms together
bonds form in order to…decrease PEincrease stability
B. Vocabulary
CHEMICAL FORMULA
MolecularFormula
FormulaUnit
IONIC COVALENT
COCO22NaClNaCl
B. Vocabulary
COMPOUND
TernaryCompound
BinaryCompound
2 elements more than 2elements
NaNONaNO33NaClNaCl
B. Vocabulary
ION
PolyatomicIon
MonatomicIon
1 atom 2 or more atoms
NONO33--NaNa++
C. Bond PolarityMost bonds are
a blend of ionic and covalent characteristics.
Nonpolar Covalent Bond e- are shared equally symmetrical e- density usually identical atoms
C. Bond Polarity
+ -
C. Bond PolarityPolar Covalent Bond
e- are shared unequally asymmetrical e- density results in partial charges (dipole)
Nonpolar
Polar
Ionic
View Bonding Animations.
C. Bond Polarity
C. Bond PolarityElectronegativity
Attraction an atom has for a shared pair of electrons.
higher e-neg atom -
lower e-neg atom +
C. Bond PolarityElectronegativity Trend (p. 151)
Increases up and to the right.
C. Bond PolarityDifference in the
elements’ e-negs determines bond type