Explanation:
It is known that dots present around the symbol of an element denotes the number of valence electrons present in the element.
For example, atomic number of calcium is 20 as it has 20 protons. So, its electronic distribution is as 2, 8, 8, 2.
Hence, it means that an atom of calcium contains 2 valence electrons and in order to attain stability it readily loses those two electrons.
Therefore, we can conclude that an electron dot diagram for calcium will have 2 dots around the symbol Ca.
