Answer:
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Explanation:
The Zeff for 3d electron of Cr 4s electron of Cr 3d electron of Cr+3 3s electron of Cr+3 are in the order respectively (1) 4.6, 2.95, 4.95, 8.05 (2) 4.95, 2.95, 4.6, 8.08 (3) 4.6, 2.95, 5.3, 12.75 (4) 4.6, 2.95, 5.3, 12.65. here zeff is the effective nuclear charge.
