What Is The Electron Configuration Of Einsteinium?

The electron configuration of einsteinium, a synthetic element with the atomic number 99, is [Rn]5f^11 7s^2. This indicates that the 99 electrons in an einsteinium atom occupy the noble gas core of radon ([Rn]) followed by filling up the 5f orbitals with 11 electrons and then the 7s orbital with 2 electrons. It should be noted that due to relativistic effects, the ordering of f-orbitals becomes distorted in heavy elements such as einsteinium.