What is the electron configuration of Mo3+?

It is [Kr]4d3.
That is shorthand for 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d3. Note there are no 5s electrons: during ionization, the electrons are removed from the s shell and the first d orbital.
Hope that helped!

Electron Configuration For Mo 3

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