CaZ =  20

From the Greek "calx", meaning "limestone"
(AM) Atomic Mass 40.078  amu    Oxidation States +2
   (BP) Boiling Point 1464  °C    (MP) Melting Point 839  °C
   (ρ) Density 1.55  g/cm3    Crystal Structure Face Centered Cubic
   ( χ ) Electronegativity 1    (AR) Atomic Radius 1.74  Å
   Physical State Solid (C) Heat Capacity 0.647  J/g °C
Electronic-Config [Ar]  4s2     (I1) First Ionization E 589.81  kJ/mol
   (ΔHvap) Heat of Vaporization 154.7  kJ/mol     (ΔHfus) Heat of Fusion 8.54  kJ/mol
   Year of Discovery 1879    Location of Discovery England
(E°) Standard Potential Ca+⇔ Ca (-3.800 V),   Ca2+⇔ Ca (-2.868 V)
Stable isotopes  40Ca,  42Ca,  43Ca,  44Ca,  46Ca
Discovered/Synthesized by Sir Humphry Davy
Natural Source The mineral/ore calcite, dolomite, gypsum, plagioclases, amphiboles, pyroxenes and garnets
Common Uses Chalk, gypsum, plaster, mortar, cement, antacids
Other Info Makes up 50 percent of bone mass as well as dental enamel
Earth’s largest carbon reservoir in the form of calcium carbonate
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