A)
B)
C)
D)
Correct Answer: B
Solution :
In [b] aufbau principle is violated Aufbau principle: In ground state of atoms, orbitals are filled in order of their increasing energies. In other words, electrons first occupy the lowest energy orbital available to them, then enter into higher orbitals only when lower energy orbitals are filled - i.e. (n + 1) rule. Is, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.
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