Calculate the Zeff (Z*) for 3d electrons of chromium atom (Slater's Rule)?

Step (1): Write the electronic configuration of Chromium (Cr) in the appropriate form.

Cr: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵ 

Cr: (1s²)(2s²,2p⁶)(3s²,3p⁶,3d⁵)(4s¹)

Step (2): Use the Slater Rule to calculate the shielding constant for the electron.

Note: And ignore the group of electron to the right of the 3d electrons, these electrons do not contribute to the shielding constant.

(S)_3d = (4s electrons)x ignore + (valence  electrons (3d)-1) x 0.35 +(remaining electrons) x 1.00

(S)_3d = (5-1)x 0.35+ (18)x 1.00  = 19.4

                      Thus Z* =Z-S = 24-19.4 = 4.6

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