Answer:
It has 2 valence electrons
It is a metal.
Step-by-step explanation:
Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal.
In chemistry, a metal is an element that readily forms positive ions (cations) by losing electrons.
Calcium belongs to group 2 and would give up it's two valence electrons in reactions.
The electronic configuration is given as;
Ca : 1s2 2s2 2p6 3s2 3p6 4s2 or [Ar] 4s²
Valence electron represents the outermost electrons.
The correct options are;
It has 2 valence electrons
It is a metal.