Question
Choose the incorrect order?

Answer

d
As per Slater's rule

$\mathop {Li}\limits_{(1.3)}  < \mathop {Na}\limits_{(2.2)}  = \mathop K\limits_{(2.2)}  < \mathop {Ca\,\,\,\,\,\,\,\,\,\,}\limits_{(2.85) \leftarrow {Z_{eff}}} $

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