Write the ground-state electron configuration of a europium atom. A) [Xe]5d⁷6s² B) [Xe]4f²5d⁵6s² C) [Xe]4f⁹ D) [Xe]4f⁷6s² E) [Xe]4f⁵5d²6s²

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The atomic number of Europium is 63, which means that it has 63 electrons. Following the Aufbau principle, electrons fill the lowest energy levels first. Thus, we fill the 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, and 6p orbitals in that order. The electron configuration of Eu is [Xe]4f7 6s2.

Write the Ground-State Electron Configuration of a Europium Atom