Chem Ch 8

Chemical bond definition

result of an attraction between atoms or ions, involve valence e-

Ionic bonds definition

1 atom transfers all valence e-s to the other which forms a cation and anion, electronegativity difference greater than or equal to 1.70

What do ionic bonds form between?

cations and anions, metals and nonmetals, opposite ends of the periodic table, electronegativity difference >1.70

Ionic bonds characteristics

high melting point, high electronegativity difference, ionize in H2O, conductive when l or aq, forms lattice (not discrete)

Covalent bonds definition

electrons are shared between atoms

Covalent bonds characteristics

mostly nonmetals, similar electronegativities, do not ionize, discrete or network solids

Network solids

not discrete, lattice, ex-diamonds, graphite, silicon dioxide

Nonpolar covalent bond

electronegativity difference 0-0.40 (included)

Polar covalent bond

electronegativity difference 0.4-1.70 (included)

Metallic bonds definition

between metals, delocalized v e-s, sea of e-s, exist in metal alloys-2 or more metals homogeneously mixed together

What is required for conductivity?

dissolving and ionization