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nvlpubs.nist.gov
4/4
A research paper from 1935 by Paul Rapp. Very trustworthy.

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Calcium chloride decreased the time of set of 11 com- mercial cements and increased the flow and the strength of the resulting concrete. The physical properties of the experimental cements were similarly affected by the addition of calcium chloride.

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MedlinePlus
4/4
Again this site is for information about diseases and treatment as well as not trying to sell us anything.

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A proper level of calcium in the body over a lifetime can help prevent osteoporosis. Osteoporosis is a disease in which the bones become fragile and more likely to break(fracture). One of the most common type of bone disease.

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MedlinePlus
4/4
This site is for information of foods and gives true facts about calcium to readers.

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Calcium is very often and involved with increasing healthy bones and teeth. It is essential for building and maintaining healthy bones.

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webmd
3/4
It seems 80% trustworthy because it gives you the right information but has ads and 'quizzes'.

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People commonly take calcium by mouth for the treatment and prevention of low calcium levels, muscle cramps, osteoporosis, softening of the bones, and PMS.

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Harvard.edu
4/4
This site is trustworthy because its from one of the best universities, Harvard.

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Calcium is a mineral most often associated with healthy bones and teeth, although it also plays an important role in blood clotting, helping muscles to contract, and regulating normal heart rhythms and nerve functions.

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britannica
4/4
This site is a dictionary and gives examples and goes the extra mile to let readers understand what calcium oxide is.

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Calcium oxide, CaO, also known as lime or more specifically quicklime, is a white or grayish white solid produced in large quantities by roasting calcium carbonate so as to drive off carbon dioxide.

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cdc.gov
4/4
This site that shows slides is 100% trustworthy, recommended by teachers and is giving out information about Calcium Silicate.

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Calcium silicate is a noncombustible, white or cream colored, free-flowing powder that is prepared commercially from lime and diatomaceous earth.

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hindawai
4/4
This site is trustworthy because it informs you about Calcium Apatite Deposition Disease (CADD) and treatment.

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A naturally occurring mineral form of calcium apatite with the formula Ca₅(PO₄)₃, but it is usually written Ca₁₀(PO₄)₆(OH)₂ to denote that the crystal unit cell comprises two entities. Also called Hydroxyapatite.

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medlineplus

3/4
This site is trustworthy because it has ".gov" and is a website trying to help inform you about calcium carbonate for your own benefit.

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Calcium Carbonate is a dietary supplement used when the amount of calcium taken in the diet is not enough.

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bionity.com
2/4
Its a site that seems to want to sell me a product. Its trustworthy enough for this information.

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Calcium Phosphide is used as a rodenticide and also in fireworks and flares. Calcium phosphide (CP, Ca₃P₂) is a chemical that has uses in incendiary bombs. It has the appearance of red-brown crystalline powder or grey lumps, with melting point of 1600 °C. Its trade name is Photophor for the incendiary use or Polythene for the use as rodenticide. Its CAS number is [1305-99-3].

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rsc.org
4/4
This source was created for academic uses; was requested by the teacher.

webmd
3/4
This source was created to find vitamins and their uses to help people who needs knowledge so it's trustworthy.

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Humphry Davy is the chemist who found Calcium in 1808 when he electrolyzed a mixture of lime and mercuric oxide.

Calcium is used for treatment and prevention of low calcium levels, muscle cramps, osteoporosis, softening of the bones, and PMS.

Calcium was named after the Latin term calx meaning lime.

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britannica.com
4/4
This source is extremely trustworthy; many teachers recommend this site.

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calcium, Chemical element, one of the alkaline earth metals, chemical symbol Ca, atomic number 20. The most abundant metallic element in the human body, it is an essential part of bones and teeth and has many physiological functions ( see calcium deficiency; tooth). It is the fifth most abundant element in Earth's crust but does not occur naturally in the free state. In its compounds calcium has valence 2. It occurs in limestone, chalk, marble, dolomite, eggshells, pearls, coral, and many marine shells as calcium carbonate, or calcite; in apatite as calcium phosphate; in gypsum as calcium sulfate; and in many other minerals. It is used as an alloying agent and in other metallurgical applications; its alloy with lead is used in cable sheathing and grids for batteries. Calcite is used as a lime source, a filler, a neutralizer, and an extender; in pure form it is used in baking powder and as an antacid and calcium supplement. Calcium oxide (lime) and its product after water addition, calcium hydroxide (slaked lime), are important industrially. Other significant compounds are calcium chloride (a drying agent), calcium hypochlorite (a bleach), calcium sulfate (gypsum and plaster of paris), and calcium phosphate (a plant food and stabilizer for plastics).

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calcium, Chemical element, one of the alkaline earth metals, chemical symbol Ca, atomic number 20. The most abundant metallic element in the human body, it is an essential part of bones and teeth and has many physiological functions ( see calcium deficiency; tooth).

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Protons: 20
Neutrons: 20
Electrons: 20

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Atomic Symbol: Ca
Atomic Number: 20