Calcium
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Calcium ( ) is the chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, and is the fifth-most-abundant element by mass in the Earth's crust. Calcium is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.
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| WebElements.com — Calcium WebElements.com — Calcium www.webelements.com/webelements/elements/text/Ca/index.html - Web |
| USDA National Nutrient Database, Calcium content o... USDA National Nutrient Database, Calcium content of selected foods www.nal.usda.gov/fnic/foodcomp/Data/SR17/wtrank/sr17a301.pdf - Web |
| UK Food Standards Agency: Calcium UK Food Standards Agency: Calcium www.eatwell.gov.uk/.../ - Web |
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| Nutrition fact sheet from the National Institutes ... Nutrition fact sheet from the National Institutes of Health ods.od.nih.gov/factsheets/calcium.asp - Web |
