Ca Calcium     Atomic number : 20 
    Relative atomic mass (12C = 12.0000) :  40.078 
    P H Y S I C A L     D A T A
Group 2 alkaline earth metal
 
Density / kg m-3 :  1550 [293 K]; 1365 [liquid at m.p.]
 
Melting point / K :  1112 
 
Boiling point / K :  1757
 
    D I S C O V E R Y
Isolated in 1808 by Sir Humphry Davy at London, England.
 
    G E O L O G I C A L     D A T A
Abundances
 
Sun (relative to H = 1 × 1012) : 2.24 × 106
 
Earth's crust / p.p.m. : 41 000
 
Residence time / years : 1 × 106
 
Classification : recycled
 
Oxidation state : II
 
  
 
Seawater / p.p.m. :
    Atlantic surface : 390
    Atlantic deep : 430
    Pacific surface : 390
    Pacific deep : 440
    B I O L O G I C A L     D A T A
Level in humans
 
Blood / mg dm-3 : 60.5
 
Bone / p.p.m. : 170 000
 
Liver / p.p.m. : 100 - 360
 
Muscle / p.p.m. : 140 - 700
 
  
 
Daily dietary intake : 600 - 1400 mg
 
Total mass of element
in average (70 kg) person :
1.00 kg

 

NetElements II  

A portrait of calcium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements.


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NetElements II last modified October 27th, 1999