How many electrons are in a calcium atom?

Answer by  Sebastiaan (19)

Calcium is the 20th element in the periodic table and contains 20 protons and 20 neutrons. When Calcium is in neutral form it contains 20 electrons. In ionized form it contains 18 electrons and it is charged 2+.

Answer by  sweeneydjg (87)

As long as the calcium atom you are describing is not an ion, there are 20 electrons found in it. Same goes for the number of protons and neutrons. Also, it is the 20th element on the periodic table with an atomic mass of 40.078 amu.