Element Calcium

Calcium ElementIt is an element with atomic symbol Ca, atomic number 20, and atomic weight 40.08.
Calcium atom is an alkaline earth metal atom. It has a role as a macronutrient.
Element Calcium plays a vital role in the anatomy, physiology and biochemistry of organisms and of the cell, particularly in signal transduction pathways.
The skeleton acts as a major mineral storage site for the element and releases Ca2+ ions into the bloodstream under controlled conditions. Circulating calcium is either in the free, ionized form or bound to blood proteins such as serum albumin.
Although calcium flow to and from the bone is neutral, about 5 mmol is turned over a day. Bone serves as an important storage point for calcium, as it contains 99% of the total body calcium. Low calcium intake may also be a risk factor in the development of osteoporosis. The best-absorbed form of calcium from a pill is a calcium salt like carbonate or phosphate.
Calcium gluconate and calcium lactate are absorbed well by pregnant women. Seniors absorb calcium lactate, gluconate and citrate better unless they take their calcium supplement with a full breakfast.

Names and Identifiers

Chemical Formula:Ca
CAS:7440-70-2
Molecular Weight:40.078 g/mol
EC Number :231-179-5
MDL Number:MFCD00085314
Color:silvery white/ gray
Other Names:Cálcio, Kalcium
PubChem CID:5460341
IUPAC Name:Calcium
Inchl:InChI=1S/Ca
InChI Key:OYPRJOBELJOOCE-UHFFFAOYSA-N
Canonical SMILES:[Ca]
ICSC Number:1192

Physical & Chemical Properties

Phase:Solid
Density:1.55 g/cm³
Boiling Point:1757 K ​(1484 °C, ​2703 °F)
Melting Point:1115 K ​(842 °C, ​1548 °F)
Molecular Formula:Ca
Flash Point:n/a
Exact Mass:39.962589
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H260
Precautionary Statements:P223-P231 + P232-P370 + P378
Hazard Codes:F:Flammable
Risk Phrases:R15
Safety Phrases:S24/25-S43-S7/8
RIDADR:UN 1404 4.3/PG 1
WGK Germany:1
RTECS:n/a
Packaging Group:I
Hazard Class:4.3

Natural calcium is a mixture of five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and 46Ca) and one isotope with a half-life so long that it can be considered stable for all practical purposes (48Ca, with a half-life of about 4.3 × 1019 years).
Calcium is the first (lightest) element to have six naturally occurring isotopes

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
40Ca39.9625906 (13)96.941 (156)00
42Ca41.9586176 (13)0.647 (23)00
43Ca42.9587662 (13)0.135 (10)7/2-1.31727
44Ca43.9554806 (14)2.086 (110)00
46Ca45.953689 (4)0.004 (3)00
48Ca47.952533 (4)0.187 (21)00

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
41Ca40.9622783102000 yEC to 41K7/2-1.595
45Ca44.956186162.7 dβ to 45Sc7/2-1.327
47Ca46.9545464.536 dβ to 47Sc7/2-1.38
49Ca48.9556738.72 mβ to 49Sc3/2
50Ca49.9575214 sβ to 50Sc0
51Ca50.961510 sβ to 51Sc; β + n to 50Sc3/2
52Ca51.96514.6 sβ to 52Sc

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