Question

Whether Ca is said to be metal or non-metal?

Answer 1

Hint :Metals comprise 78 % of all the known elements and appear on the left hand side of the periodic table. The metallic character increases from top to bottom within a group and non-metallic character increases from left to right in a period.

Complete Step By Step Answer:
Calcium belongs to the s-block of the periodic table. Calcium is an earth alkaline metal having atomic number 20. The electronic configuration of calcium is;
 $ Ca = {\left( {Ar} \right)_{18}}4{s^2} $
Calcium easily loses its 4s electrons. Thus, it has lower ionization enthalpy. Calcium shows most of the properties of metals. It is a reducing agent which reacts with halogens to form compounds. Thus, Calcium is a metal. It is a silvery white metal.
Some important properties of metals are;
-They are good conductors of heat and electricity
-They give shiny appearance (lustrous)
-They have high tensile strength
Metals are malleable that is they can be hammered into thin sheets and ductile (can be drawn into wires)
Calcium is the $ {3^{rd}} $ most abundant metal in the earth crust. It is harder than sodium but much softer than aluminium. Calcium can never be found alone in nature. It is found as gypsum, limestone in nature. Calcium is important for the growth of both human beings and plants.
Lack of calcium in the human body can cause osteoporosis, which makes the bones weak and fragile.

Note :
Calcium is a group 2 metal , it is observed that the reactivity of group 2 metals is less than that of group 1 metals. It reacts very rapidly with halogens and slowly with water. Calcium dissolves in hydrochloric acid.