Iggy's Element Bonanza! Element: Calcium Atomic Symbol: Ca Atomic Number: 20 Iggy: Calcium is the third member of the Alkaline Earth Metals family. It is important for life because it is in our bones and what keeps them strong and helps them grow! If you want to be tall like me, just drink milk! Calcium burns a brick-red color. Calcium has 5 stable isotopes, Ca-40, Ca-42, Ca-43, Ca-44, and Ca-46.