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Stuck here, help me understand: Which of the following options does not represent ground state electronic configurationof an atom?

Which of the following options does not represent ground state electronic configuration of an atom?

  • Option 1)

    1s^{2}2s^{2}2p^{6}3s^{3}3p^{6}3d^{8}4s^{2}

  • Option 2)

    1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{1}

  • Option 3)

    1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^{1}

  • Option 4)

    1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{9}4s^{2}

 
Answers (1)
89 Views
V Vakul

 

Aufbau Principle -

In the ground state of the atoms, the orbitals are filled in order of their increasing energies.

- wherein

 

Electrons fill the orbitals in the order of increasing energy. By t hat rule 3d orbit should fill up before 4s.


Option 1)

1s^{2}2s^{2}2p^{6}3s^{3}3p^{6}3d^{8}4s^{2}

Incorrect

Option 2)

1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{1}

Incorrect

Option 3)

1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^{1}

Incorrect

Option 4)

1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{9}4s^{2}

Correct

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