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Fill up orbitals according to the order above until you reach 20 total electrons. Nevertheless, check the complete configuration and other interesting facts about calcium that most people don't know. Periodic Table of Elements Electron configuration Calcium is preceded by argon which has 18 electrons so the remaining two electrons are written after the symbol for argon. Electron configuration of calcium 20 . View available hint(s) what is the electron configuration of calcium, which has 20 electrons? When the atom is in excited state, one or more electrons go to a higher energy state, so electron configuration of the excited atom is different. In order to write the calcium electron configuration we first need to know the number of electrons for the ca atom (there are 20 electrons). Energy level changes as you go up. A neutral calcium atom also has 20 electrons. For example, the electron configuration of sodium is 1s 2 2s 2 2p 6 3s 1. 2 8 8 2 calcium discovery.