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Why 4f orbitals are filled first then 5d orbitals?
(Need proper explanation)
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The particles fill up the orbit according t the ratio of the energy. At first the electrons fill up the orbits of lower level then expands towards the higher level. The shell 4f has the experience of lower level of energy than the shell 5d. And its the reason due to which 4f orbitals are filled first then the 5d orbitals are filled.
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Because of Aufbau principle.
Explaination :-
1.It states that the orbitals are filled in order of their increasing energy.
2. It is filled by (n + 1) rule.
3.Lower the value of (n +1),lower is the energy.
4.If two orbitals have same value, orbitals with lower value of n has lower energy.
Therefore, 4f < 5d
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