Orbital electronegativity and electron affinity of rare earth atoms using Xα-theory

Slater's transition state concept and the relativistic numerical Hartree-Fock-Slater theory has been used to calculate the electronegativity and first ionization potential for the rare earth atoms. Based on these results the electron affinity has also been estimated. The theory predicts almost constant values of the electronegativity as 2 eV, first ionization potential as 8 eV and the electron affinity of -(4–5) eV respectively.This work is dedicated to the memory of Prof. J. C. Slater.Alexander von Humboldt fellow, on leave from school of chemistry, University of Hyderabad, India.