Question

Based on knowledge of the electronic configuration of niobium, state which of the following compounds of...

Based on knowledge of the electronic configuration of niobium, state which of the following compounds of niobium is unlikely to exist.

Ca2NbO4
NaNbO3
Na2NbO2
Ca3NbO6
Na3NbO3

Homework Answers

Answer #1

oxidation state of Nb in Ca2NbO4 = +4

oxidation state of Nb in NaNbO3 = +5

oxidation state of Nb in Na2NbO2 = +2

oxidation state of Nb in Ca3NbO6 = +6

oxidation state of Nb in Na3NbO3 = +3

Number of electron in Nb = 41

Electronic configuration is: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d4 5s1

Explanation: d block anomaly

Noble gas having lesser electron than Nb and closest to it is Krypton (Kr)

Number of electron in Kr = 36

electronic configuration of Kr is: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6

So, electronic configuration of Nb in noble gas form is: [Kr] 4d4 5s1

It can loose maximum 5 electrons and hence can form upto +5 oxidation state

Oxidation state of +6 is not possible for Nb

Answer: Ca3NbO6

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