Strontium is an important element and its atomic number is 38. Which means that there are 38 protons and electrons in strontium. The complete electronic configuration of Strontium is 1s2 2s2 2p6 3s23p6 4s2 3d10 4p6 5s2. The shortened form of electronic configuration of strontium can also be written as [Kr] 5s2.