If n=6, the correct sequence for filling of electrons will be:
As we learnt in
Aufbau Principle -
In the ground state of the atoms, the orbitals are filled in order of their increasing energies.
In the ground state of atoms, the orbitals are filled in order of their increasing energies.
Clearly for n=6, we have the order 6s, 4f, 5d, 6p or ns, (n-2)f, (n-1)d, np
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