We compute the isotope shifts of the total electron binding energy of neutral atoms and singly charged ions up to element $Z=120$, using the relativistic Hartree-Fock method including the Breit interaction. Field shift coefficients are extracted by varying the nuclear charge radius; a small quadratic term is retained to cover large radius changes relevant to superheavy nuclei. We tabulate isotope shift coefficients for closed-shell systems from Ne to Og and benchmark selected open-shell cases, used to test the interpolation formula. A simple power-law interpolation $b{Z}^k$ reproduces calculated field shifts to within about 1% across the table, with the effective exponent $k$ growing from roughly 5 near $Z\sim 50$ to about 12 at $Z\sim 118$. Due to the domination of inner shells, differences between neutrals and singly charged ions does not exceed a few percent, becoming noticeable mainly when an outer $s$ electron is removed. Therefore, these results may also be used for higher charge ions.

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• Atomic & molecular structure
• Electronic structure of atoms & molecules
• Hartree-Fock methods