Which of the following electron configurations correctly describes the ground state of a niobium (Nb) atom?...

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Question

Which of the following electron configurations correctly describes the ground state of a niobium (Nb) atom? A periodic table may be helpful.

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s¹4d⁴

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d³

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²5p⁴

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵5s²4d⁵

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d⁶

Answer 1

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