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Einsteinium has the atomic number of 99. Thus, it has 99 protons and, to keep it neutral, 99 electrons. Filling in the first 99 electron orbitals gives us the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f11.

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Q: What is the expanded electron configuration for es?
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