INO-11

18-electron count

ne = nd + 2 nL − q for MLn^{q}. Closed-shell organometallic count.

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Organometallic18-electron rule

Governing equation

n_e=n_d+2n_L-q

where

n_d: Metal d count (—)
n_L: L-type ligands (—)
q: Complex charge (—)
n_e: Electron count (—)

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-11 — 18-electron count) is the form associated with 18-electron rule. Working symbols: $n_d$ , $n_L$ , $q$ $\rightarrow$ $n_e$ . A filled s+p+d valence set is 18. Deviations are common for early metals and π-loaded ligands.

Purpose

Purpose: compute

n_e

from

n_d

n_L

q

in Inorganic chemistry via

n_e=n_d+2n_L-q

ne = nd + 2 nL − q for MLn^{q}. Closed-shell organometallic count. 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

n_d = 8.000\,\mathrm{—}

n_L = 5.000\,\mathrm{—}

q = 0.000\,\mathrm{—}

, the governing relation

n_e=n_d+2n_L-q

yields

n_e = 18\,\mathrm{—}

. Neutral-ligand (CBC) snapshot: each L donates 2, charge q on the complex. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Metal d count n_d8 —L-type ligands n_L5 —Complex charge q0 —

Outputs

Electron count n_e18 —

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Narration of this film

Neutral-ligand (CBC) snapshot: each L donates 2, charge q on the complex.

A filled s+p+d valence set is 18. Deviations are common for early metals and π-loaded ligands.

Reading speed

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