Rhoades,+Jordan



Calcium was discovered in 1808, in England buy Sir Humphrey Davy. Calcium got its name because of the Latin word “calx” which means “lime.” Davy found this because calcium was found to be a mixture of lime and mercuric oxide (HgO). Calcium also got its name was because of the Romans, again by the word “calx.” They believed that calcium was to help broken bones.
 * Calcium- Ca
 * Atomic number- 20
 * Atomic mass- 40
 * Protons- 20
 * Electrons- 20
 * Neutrons- 20
 * Boiling point- 1757 K {148 decrease C }
 * Melting point- 1115 K {1484 decrease C} [[image:lvscience/calcium-food.jpg]]
 * Density- 1550 kg m-3


 * Valence electrons- 2
 * Electron configuration and orbital notation- 1s2 2s2 2p6 3s2 3p6 4s
 * Orbital Notation-
 * Chemical reactions- Calcium is found in many minerals such as, limestone and fluorite.

Calcium is considered as an alkaline earth element, which is found in group 2 on the periodic table. Its reacts with lots of things. Such as, it reacts with water and it burns. > s, such as, kidney stones and kidneys and sclerosis.
 * Calciumis the most important metal in the human body. It is mostly found in milk produces and also found in vegetables, nuts and beans. Calcium helps our skeletons, teeth, nerves and muscles. The average human used 2,5 grams a day. If it doesn’t work property it can cause health issu
 * The price of calcium is 20 $/100g. [[image:lvscience/Ca2.jpg]]

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