Calcium Facts

Calcium Facts
Calcium (Ca) is a gray, soft alkaline earth metal with an atomic number of twenty. It is a vital element for living organisms.
Interesting Calcium Facts:
Calcium is the fifth most plentiful element in the Earth's crust.
It is also the fifth most abundant element found dissolved in the oceans.
Calcium has been in use for over 16,000 years, but was formally isolated in 1808 by Sir Humphry Davy.
It is not found in its natural state, but is found commonly in minerals and in its compounds.
There are fifteen recognized compounds for calcium, all with unique industrial uses.
Calcium is used in the creation of hydrogen, as it reacts with water to give off the gas.
Calcium is slow to react in water because it is coated in an insoluble calicum hydroxide.
Calcium is the lightest of the alkaline earth metals with a density of 1.55 g/cm3.
There are two allotropes of of calcium.
Calcium is the fifth more prevalent element in the human body.
It has many functions in the body, but mostly it is used to provide support for the skeleton.
There is approximately one kilogram of calcium in an average-sized human skeleton.
Calcium's high atomic number is what allows human bones to show up under Xray.
Calcium joins with phosphate to form hydroyxlapatite, the main component in bones and tooth enamel.
Calcium has four stable isotopes and two unstable isotopes.
The half-lives of the unstable calcium isotopes are so long that they may be considered almost stable.
Ca-41 decays to an isotope of potassium, and scientists use this decay as an indication of anomalies in solar systems.
Calcium and most of its compounds are fairly low in toxicity.
Calcium has very few environmental dangers.
When consumed in excess, however, calcium overdose can lead to kidney failure.

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