Science, asked by rashidabegum0207, 17 days ago

why does an electron first fill 2P orbital and then 3S orbital?​

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Answered by InstaPrince
42

Required Answer:

The aufbau principle explains how electrons fill low energy orbitals (closer to the nucleus) before they fill higher energy ones. Everything is straightforward up to this point, but the 3-level orbitals are not all full - the 3d levels have not been used yet.

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