According to aufbau principle, the correct order of energy of 3d, 4s and 4p-orbitals is

The correct orders of increasing energy of atomic orbitals is

The decreasing order of energy of the 3d,4s,3p,3s orbital is :-

The correct order of closeness of 3s,3p,3d orbitals of nucleus is :

Write the increasing order of energies of 4s,3p,4p and 3d.

The order of energy of orbitals is s lt p lt d lt f

Aufbau principle does not give correct arrangment of filling up of atom orbitals in :

The correct order of energy of orbitals in square planner complex may be

Assertion: La should be the f-block element according to Aufbau principle. Reason: 57th electron exceptionally enters in 5d orbital. If both (A) and (R) are correct and (R) is the correct explanation of (A). If both (A) and (R) are correct, but (R) is not the correct explanation of (A). If (A) is correct, but (R) is incorrect. If (A) is incorrect but (R) is correct.

According to Aufbau principle , the 19^(th) electron in an atom goes into the :-

a. In the sixth period, after filling of 6p orbitals, the next electron (i.e. 57th ) enters the 5d -orbital against aufbau principal and there after the filling of seven 4f -orbitals starts with cerium (Z = 71) . Explain this anomalous behaviour.