INO-23

Oxidation number snapshot (XOn^q)

ox(X) = −q + 2 n for an oxoanion XOn^q (O as −2).

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RedoxIUPAC oxidation number

Governing equation

\mathrm{ox}(X)=-q+2n

$n \in \left[1, 8\right]$

where

n: Oxygen count (—)
q: Ion charge (—)
ox: Oxidation number (—)

The figure, part by part

Each numbered marker wears the color of its card. Hover a card to light the marker. Tap a marker to jump to that card. The slider walks a red point along the curve; Animate drawing traces it like a pen.

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①

Governing law — red

\mathrm{ox}(X)=-q+2n

$n \in \left[1, 8\right]$

$n = 1$ $ox = 4$

Along the curve

②

Domain of the variable — blue

n_{\min} = 1,\quad n_{\max} = 8

$n \in \left[1, 8\right]$

$n = 1$ $n = 1$

Along the curve

③

Response curve — green

\mathrm{ox}(X)=-q+2n

$n \in \left[1, 8\right]$

$n = 1$ $ox = 4$

Along the curve

④

Rate of change — amber

\frac{\mathrm{d}ox}{\mathrm{d}n}

$n \in \left[1, 8\right]$

$n = 1.044$ $ox^{\prime} = 2$

Along the curve

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-23 — Oxidation number snapshot (XOn^q)) is the form associated with IUPAC oxidation number. Working symbols: $n$ , $q$ $\rightarrow$ $ox$ . Oxidation number is a bookkeeping charge, not a physical charge. Oxygen is −2 except in peroxides.

Purpose

Purpose: compute

ox

from

n

q

in Inorganic chemistry via

\mathrm{ox}(X)=-q+2n

ox(X) = −q + 2 n for an oxoanion XOn^q (O as −2). 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 = 4.000\,\mathrm{—}

q = -2.000\,\mathrm{—}

, the governing relation

\mathrm{ox}(X)=-q+2n

yields

ox = 10\,\mathrm{—}

. Single central atom, all oxygen −2, charge q of the ion. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

Oxygen count n4 —Ion charge q-2 —

Outputs

Oxidation number ox10 —

Reading speed

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Narration of this film

Single central atom, all oxygen −2, charge q of the ion.

Oxidation number is a bookkeeping charge, not a physical charge. Oxygen is −2 except in peroxides.

Reading speed

Watch on YouTube