Why is 4s orbital filled before the fill...

Why is 4s orbital filled before the filling of 3d orbital?

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While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?

Why is 4s shell filled before 3d shell? Explain in the light of n+I rule

Assertion (A) : When the transition element ionises, the 4s -orbital electrons are removed before the 3d -orbital electrons. Reason (R ) : The energy of 3d -orbital electrons is lower than that of 4s -orbital electrons.

Which of the following be the basis of entry of an electron is 4s orbital before 3d orbital ?

Assertion : In transition elements radii of 5d series are virtually the same as those of the corresponding members of 4d series. Reason : The filling of 4f orbitals before 5d orbitals results in regular decrease in atomic radii.

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.

What is orbital angular momentum of an electron in 3d orbital.

4s orbitals has less energy than 3d orbital

Which orbitals are filled with electrons in 3rd period?

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