INO-14

Slater effective nuclear charge

Zeff = Z − σ. Screening constant σ from Slater's rules.

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AtomicSlater 1930

Governing equation

Z_{\mathrm{eff}}=Z-\sigma

where

Z: Atomic number (—)
\sigma: Screening σ (—)
Z_{eff}: Effective Z (—)

Lecture brief

Historical brief

Pauling and Allred–Rochow electronegativity, Kapustinskii lattice energy, CFSE and Goldschmidt radii organise the periodic solid. The sheets predict bond character and crystal packing. This sheet (INO-14 — Slater effective nuclear charge) is the form associated with Slater 1930. Working symbols: $Z$ , $\sigma$ $\rightarrow$ $Z_{eff}$ . Electrons in inner groups screen more than those in the same group. Zeff sets size and EN.

Purpose

Purpose: compute

Z_{eff}

from

Z

\sigma

in Inorganic chemistry via

Z_{\mathrm{eff}}=Z-\sigma

Zeff = Z − σ. Screening constant σ from Slater's rules. Use it when a real inorganic chemistry question must be answered in SI before a code check.

Live realistic example

In symbols

Live case. Given

Z = 17.000\,\mathrm{—}

\sigma = 10.900\,\mathrm{—}

, the governing relation

Z_{\mathrm{eff}}=Z-\sigma

yields

Z_{eff} = 6.10\,\mathrm{—}

. Enter Z and a precomputed Slater σ. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Atomic number Z17 —Screening σ \sigma10.9 —

Outputs

Effective Z Z_{eff}6.10 —

Reading speed

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Narration of this film

Enter Z and a precomputed Slater σ.

Electrons in inner groups screen more than those in the same group. Zeff sets size and EN.

Reading speed

Watch on YouTube