slater rule

Slater rule is for finding effective nuclear charge Zeff=Z-S (Z=Nuclear charge or proton,S=shielding electron) Electronic configuration of Zn=1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 Z=30 ,S=12 Zeff=30-12 Zeff=18

No answer should be 2 because for Ist transition metal Zeff is always 2 Zeff=30-28=2

This is a exception case

Complete step by step answer: Write the electronic configuration of Zinc Atomic number of Zinc is 30 Hence its electronic configuration is1s2,2s22p6,3s23p6,3d10,4s2 Find the number of electrons in n shell. In the given case, n=4 and the number of electrons is 2. But we will take only 1 electron. Find number of electrons in n-1 shell. There are 18 electrons in the third shell. Find the number of electrons in the remaining inner shells The remaining inner shells include the first and second shell. There are 10 electrons in the first and second shell. Calculate the shielding constant using slater’s rule Shielding effect =(0.35×1)+(0.85×18)+(1.00×10)=25.65