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a. In the sixth period, after filling of...

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.

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To explain the anomalous behavior of electron filling in the sixth period, we need to understand the principles of electron configuration and the energy levels of orbitals. ### Step-by-Step Solution: 1. **Understanding Electron Configuration**: - The Aufbau principle states that electrons fill orbitals starting from the lowest energy level to the highest. In the sixth period, the order of filling typically follows the sequence of orbitals: 6s, 6p, 5d, and then 4f. 2. **Filling of 6p Orbitals**: ...
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