Use Slater\'s rules to calculate the effective nuclear charge,
Z* or Zeff, for a 3p electron in P, S, and Cl.
Use Slater\'s rules to calculate the effective nuclear charge,
Z* or Zeff, for a 3d electron in Fe, Co, and Ni.
Use Slater\'s rules to calculate the effective nuclear charge,
Z* or Zeff, for a 4f electron in Sm, Eu, and Tb.