In the transition elements, the incoming electron occupies (n-1)d sublevel in preference to:

  • Option 1)

    np

  • Option 2)

    ns

  • Option 3)

    (n-1)d

  • Option 4)

    (n+1)s

 

Answers (1)

As we learned in concept

Aufbau Principle -

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

- wherein

 

According to  Aufbau principle the electrons are filled in the order of energy of the orbitals. The orbital that is filled after (n-1)d is np by order of energy.


Option 1)

np

Correct

Option 2)

ns

Incorrect

Option 3)

(n-1)d

Incorrect

Option 4)

(n+1)s

Incorrect

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