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Shweta Thakur posted an Question
May 11, 2020 • 04:55 am 30 points
  • IIT JAM
  • Chemistry (CY)

Plz solve this ... i think the answer written here is wrong plz check... glrde01 the 285, first has higher etfective nucge 3. find out the shielding constant

gLrdE01 The 285, first has higher etfective nuclear charge 3. Find out the shielding constant and eftective nuclear charge

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    Lingareddy 1 Best Answer

    The formula to be used is:  Z* = Z - S  where:  Z* = effective nuclear charge  Z = atomic number of Fe= 26 S = shielding  Let us first calculate S using Slater's rule.  *Write the electronic configuration as follows: (1s)^2 (2s 2p)^8 (3s 3p)^8 (3d)^6(4s)^2 *Electrons in an "s" or "p" orbit in the same shell as the electron for which you're solving contribute 0.35, electrons in an "s" or "p" orbital in the shell one energy level lower contribute 0.85, and electrons in an "s" or "p" orbital in shells two energy levels and lower contribute 1. Therefore, the (4s)^2 do not contribute since we are focusing on the 3d orbital. Therefore,  S = (5x 0.35) + (18 x 1) =19.75 Thus,  Z* Z - S = 26-19.75= 6.25 Similarly cobalt   S = (6x 0.35) + (18 x 1) =20.1 Thus,  Z* Z - S = 27-20.1= 6.9

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