Question

calculate the effective nuclear charge for the 4S electron of Fe atom which has the atomic number 26 and electron configuration 1S 2S 2P 3S 3p 3D 4s.

1. 3.75
2. 6.25
3. 2.75
4. 3.25
please correct answer​

Answer 1

Answer:

3.25 kekekekemnenene

Answer 2

• We need to find the effective nuclear charge for 4s electron in Fe atom with atomic number 26.

• For that, we will use Slater's rules to calculate the effective nuclear charge. Writing the electronic configuration in Slater's notation.

         (1s)²  (2s2p)⁸  (3s3p)⁸ (3d)⁶  (4s)²

• According to Slater's rules:                                                                       shielding by n=4 electron = 0.35 unit                                                                       by n-1=3 electrons = 0.85 unit                                                                       by n-2 and further electrons (for n=1,2) = 1.0 unit

• Now, calculating the shielding constant for 4s electron:

         σ = 1×0.35 + 6×0.85 + 8×0.85 + 8×1.0 + 2×1.0

         σ = 22.25

• So, the effective nuclear charge = Atomic number - Shielding constant

         Z* = Z - σ = 26 -  22.25 = 3.75

        So, correct answer is option 1) 3.75