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Arrange s, p and d sub-shells of a shell in the increasing order of effective nuclear charge (Zeff) experienced by the electron present in them.

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The arrangement of sub-shells in order of effective nuclear charge is: d < p < s. The net positive charge experienced by an outer electron is known as an effective nuclear charge (Zeff). This charge decreases with an increase of azimuthal quantum number (l), that is, the s orbital electron will be more tightly bound to the nucleus than p orbital electron which in turn will be better tightly bound than the d orbital electron.

 

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