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Calcium is good for growth in both plants and humans and therefore impact on environment is minimal

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Its found throughout earth mostly in the form of rocks and minerals like limestone, dolomite and gypsum

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The outermost shell has 2 electrons. It can easily donate these 2 electrons. It is now what is called a cation (ca+2). So it can easily form compounds with non metals

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In England when Humphry electrolyzed a mixture of lime and mercuric oxide.

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1808

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Humphry Davy

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https://hobart.k12.in.us/ksms/PeriodicTable/calcium.htm

https://www.webelements.com/calcium/

http://www.rsc.org/periodic-table/element/20/calcium

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1.55 grams per cubic centimeter

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Silvery Grey

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1484.0° C

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839.0° C

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It can be a liquid solid or gas

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20

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20

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20

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40.078

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20

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Ca

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Calcium
Symbol-Ca
Atomic number-20