Calcium(鈣)

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Calcium
Calcium is a rather hard element that is purified by electrolysis from calcium 
fluoride that burns with a yellow-red flame and forms a white nitride coating 
when exposed to air. It reacts with water displacing hydrogen and forming 
calcium hydroxide.

The advantage of calcium:
1.It is a very hard metal.

The disadvantage of calcium:
It is expensive to obtained by electrolysis. 

The uses of Calcium:
It use to deoxidizer(去氧劑), desulfurizer, or decarburizer for various ferrous and 
nonferrous alloys. Alloying agent used in the production of aluminum, 
beryllium, copper, lead, and magnesium alloys.