What is the ground-state electron configuration of terbium (Tb)? A)1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶5d⁹6s² B)1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p³ C)1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶5d¹⁰6s¹ D)1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d⁹4f¹⁰5s²5p⁶6s² E)1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f⁹5s²5p⁶6s²

Question

Quizplus · Accepted Answer

The ground-state electron configuration of terbium (Tb) is correctly represented in option E, which follows the order of filling orbitals: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p. Terbium, with an atomic number of 65, has its electrons filling up to the 4f orbital, with 9 electrons in the 4f orbital, which matches the configuration given in option E.

What Is the Ground-State Electron Configuration of Terbium (Tb)