Atomic Number: 99

Name: Einsteinium

Atomic symbol: Es

Atomic Weight: 252.0829

Electron configuration: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰5f¹¹6s²6p⁶7s²