Anthony T. answered • 06/01/23
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If you mean the element that only has d sub-levels filled and no f sub-levels, then 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d4 is the answer.
Anthony T.
I searched the internet and found that Niobium is an exception to the usual atomic orbital filling rules. One explanation I found: "For example, niobium (Nb, atomic number 41) is predicted to have the electron configuration [Kr]5s24d3. Experimentally, we observe that its ground-state electron configuration is actually [Kr]5s14d4. We can rationalize this observation by saying that the electron–electron repulsions experienced by pairing the electrons in the 5s orbital are larger than the gap in energy between the 5s and 4d orbitals."
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06/01/23
Anthony T.
I searched the internet and found that Niobium is an exception to the usual atomic orbital filling rules. This exception is found experimentally.
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06/01/23
J.R. S.
06/01/23