does ca2

What Is The Electron Configuration Of Ca2 +? A calcium 2+ ion has lost its two valence electrons, and now has 18 electrons. Thus, the electron configuration of a Ca2 + ion is : 1s2 2s2 2p6 3s2 3p6, Was this answer helpful? How many neutrons does ca2+ have? 2 Answers. Johnson Z. In calcium-40,