Question

Explain why the electrons enter into 4s orbital but not 3d after filling the 3p orbital ?​

Answer 1

Answer:

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Explanation:

Because according to Aufbau's principle,electrons get filled in the increasing level of energy of the orbitals,after 3p, among 4s(n+l=4) and 3d(n+l=5) energy of 4s is lower due to lower (n+l) value, therefore electrons tend to fill in the 4s orbital first.

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Answer 2

Explanation:

According to the Aufbau principle, the 4s sublevel is filled before the 3d sublevel because the 4s is lower in energy. As the 3d sublevel becomes populated with electrons, the relative energies of the 4s and 3d fluctuate relative to one another and the 4s ends up higher in energy as the 3d sublevel fills.