Thursday, 20 December 2012

Calcium=الكلسيوم

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Calcium=الكلسيوم
WIKIPEDIA
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 Ca Greek/Latin χάλιξ/calx χάλιξ means "pebble", and calx means limestone[16] Latin calx

From Latin "calx", which means "lime". Calcium was known as early as the first century when the Ancient Romans prepared lime as calcium oxide.

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