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Additional
calcium
English Wikipedia - The Free Encyclopedia
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Calcium
Calcium
is a
chemical element
with symbol
Ca
and
atomic number
20. Calcium is a soft gray
alkaline earth metal
,
fifth-most-abundant element by mass
in the
Earth
's
crust
. The ion Ca
2+
is also the fifth-most-abundant dissolved
ion
in
seawater
by both
molarity
and mass, after
sodium
,
chloride
,
magnesium
, and
sulfate
. Free calcium metal is too reactive to occur in nature. Calcium is produced in
supernova nucleosynthesis
.
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