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Ramu gave electronic configuration of potassium as 1s2 2s2 2p6 3s2 3p6 3d1 whereas Ravi expressed the configuration as 1s2 2s2 2p6 3s2 3p6 4s1. Who gave the correct configuration? Why?

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Ravi gave the correct configuration because according to Aufbau principle after completion of 3p orbital electron may enter either 4s or 3d. Their n + l values are given below.

Orbital n + l Values
4s 4 + 0 = 4
3d 3 + 2 = 5

So 4s orbital has lower n + l value when compared with 3d orbital. So electron enters into 4s.

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