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calcium [Ca]
From the Latin clax meaning lime. Romans used lime dating at least as far back of 100 AD Isolated by Sir Humphrey Davy in 1808.
Occurrence:
1) 5th most abundant element in earth's crust
2) found only in combination
Characteristics:
1) silver-white bivalent metallic element of the alkaline-earth group
2) reacts vigorously with air or water
Uses: see Ca+2
Related
Ca+2
periodic table
General
alkaline earth metal
Properties
SIZE: AW = 40.08
atomic number
VALUE: 20
VALENCE: AR 4S2
Database Correlations
PUBCHEM correlations
References
- Webster's Ninth New Collegiate Dictionary, Miriam-
Webster Inc. Springfield, MA 1990
- Chemical & Engineering News, Sept 8, 2003