The effective nuclear charge experienced by 2p election is 12.5 and 3p electron is 5.7...
Effective nuclear charge is defined as the positive charge that is the attraction of nuclear protons interacting with valence electrons.
The effective nuclear charge is always less than the total number of protons in the nucleus due to shielding effects.
The effective nuclear charge can be approximated by
Zeff = Z - S
where Z is the atomic number and S shielding effect by valence electrons.
Consider the chlorine atom, electronic configuration of chlorine is 1s² 2s² 2p⁶ 3s²3p⁵
and the effective nuclear charge experienced by 3p electrons is Zeff = Z-S = 17 - S. The shielding effect for different group values is
n --> 7×0.35 , n-1 --> 8×0.85 ,n-2 --> 2×1
Total S = 2.45+6.8 + 2 = 11.25
Zeff = 5.75
For 2p electrons (1s²)(2s²2p⁶)
Zeff = 17 - 2 x 0.85 - 8 x 0.35 = 12.5
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