From Wikipedia,
the free encyclopedia.
Class A metals are
metals that form
hard acids. Hard acids are
acids with relatively
ionic bonds. These metals,
such as
iron,
aluminum,
titanium,
sodium,
calcium and the
lanthanides, would rather
bond with
fluorine than
iodine. They form stable
products with hard
bases, which are bases with
ionic bonds.
Class B metals are
metals that form soft acids. Soft
acids are acids with relatively
covalent bonds. These metals,
such as
lead,
gold,
palladium,
platinum,
mercury and
rhodium, would rather bond
with iodine than fluorine. They
form stable products with soft
bases, which are bases with
covalent bonds.
