Question

Explain the reason why an electron occupies 6s first instead if 4f ?
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Answer 1

Answer:

The aufbau principle explains how electrons fill low energy orbitals (closer to the nucleus) before they fill higher energy ones. ... Similar confusion occurs at higher levels, with so much overlap between the energy levels that the 4f orbitals do not fill until after the 6s, for example.

Answer 2

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The aufbau principle explains how electrons fill low energy orbitals (closer to the nucleus) before they fill higher energy ones. Similar confusion occurs at higher levels, with so much overlap between the energy levels that the 4f orbitals do not fill until after the 6s, for example.

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