What is the correct electon configuration for the element Molybdenum (Mo)

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d4

Molybdenum has 42 electrons all together. If you add all the number of electrons in this configuration, it equals to 42.

The correct answer is: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^5 5s^1
But my guess is your instructor will not know this.

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1s2
2s2 2p6
3s2 3p6 4s2
3d10 4p6 5s2 4d4