Question

On the periodic table, calcium is in group 2. What is true about calcium?

Answer 1

Calcium is a member of the alkaline earth metals and is located in Group 2. It has an electron configuration of [Ar]4s² and tends to lose both of its valence electrons to become a Ca²+ ion.

Step-by-step explanation:

Calcium is a member of the alkaline earth metals and is located in Group 2 of the periodic table. Its electron configuration is [Ar]4s², indicating that it has 2 valence electrons in its outermost electron shell. When forming a cation, calcium tends to lose both of its valence electrons and become a Ca²+ ion, which has an electron configuration of [Ar].

Answer 2

Step-by-step explanation:

Calcium is all around us. The average human contains approximately 1kg of calcium, of which 99% is stored in our bones. It is the 5th most abundant element in the earth's crust, occurring widely as calcium carbonate which is more commonly known as limestone. It is also the fifth most abundant dissolved ion in seawater.