CHEM 1A Lecture Notes - Lecture 19: Intermetallic, Metal, Metalloid
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Chemistry 1A
Properties of Ionic, Covalent, and Metallic
● Ionic
○ At room temp., exists as solid
○ High melting/ boiling point
○ Usually dissolves in H2O
● Covalent
○ Solid, gas, or liquid
○ Low melting/ boiling point
○ Usually does not dissolve in H2O
● Metallic
○ Solids
○ High melting/ boiling point
○ Does not dissolve in H2O
Chemical Bonding
● Metalloid (on metal side) + metal= covalent
○ E.g. C & Si
● Metalloid (on nonmetal side) + metal= ionic
○ E.g. Ag & Ga
● Hydrogen is exception to rule. Forms covalent bonds.
● 2 metals (intermetallic compound) is metallic
○ E.g. CuAl2
● 3+ nonmetal compounds= covalent & stable free molecules
○ E.g. H2SO4
● Metal + polyatomic ions = ionic (same with nonmetal + polyatomic ions)
○ E.g. NaNO3, NH4Cl
● Cation charge = anion charge
● Transition metals can have varying charges
● Transition metals= no fixed charge
● Sn (ClO4)2
○ ClO- x 2= -2 charge
○ Charge for Sn would be 2+
● Ni (CO3)2
○ CO32-x 2 = -4 charge
