Question

Symbol of calcium is:
A. $Ca$
B. $Cal$
C. $C$
D. None of the above

Answer 1

Hint:Calcium is a chemical element present in the second group in the periodic table. It belongs to the alkaline earth metals. Its atomic number is $20$ with an atomic mass of $40$ . It is denoted by the symbol $Ca$ . It is a very reactive metal and forms a dark oxide-nitride layer when it comes in contact with air.

Complete answer:
Calcium is a chemical element present in the second group in the periodic table. It belongs to the alkaline earth metals. Its atomic number is $20$ with an atomic mass of $40$ . It is denoted by the symbol $Ca$ . It is a very reactive metal and forms a dark oxide-nitride layer when it comes in contact with air.
Its physical properties as well as chemical properties are mostly similar to strontium and barium. In the earth’s crust it is the fifth most abundant element. Calcium carbonate is the most common compound of calcium. There are various sources of calcium such as limestone, gypsum, anhydrite, fluorite, apatite and so on. Apart from the correct option, we must know about the other symbols given above such as in option C, the symbol $C$ represents carbon. It is also a chemical element.
And option B that is $Cal$ is not any element in the periodic table.

Hence, option A is correct.

Note:
Steel making requires calcium at a large scale because calcium has strong chemical affinity for oxygen and sulphur. When its oxides and sulphides get formed it gives liquid lime aluminate and sulphide inclusions in steel which float out. Also calcium is used to strengthen the aluminium alloys used for bearings, for the control of graphitic carbon in cast iron, and to remove bismuth impurities from lead.