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