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Electron Configurations of Atoms

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What is wrong with the following electron configurations for atoms in their ground states?
a. 1s^(2)*2s^(2)*3s^(1)
b. [Ne]2s^(2)*2p^(3)
c. [Ne]3s^(2)3d^(5)

Please provide a detailed explanation.

Thanks!

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The expert examines what is wrong with the following electron configurations.

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Dear Student,

Please see the attached file for the electronic configuration of atoms.

Thank you.

The order of filling up the orbitals with electrons, according to the Aufbau principle, is based on the energy of the orbitals. The rule is: "an orbital with ...

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