INO-27

Radius ratio

CN prediction.

Reading speed

InorganicGoldschmidt

Governing equation

\\rho=r_+/r_-

where

r^+: r+ (Å)
r^-: r- (Å)
\rho: ρ (—)

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-27 — Radius ratio) is the form associated with Goldschmidt. Working symbols: $r^+$ , $r^-$ $\rightarrow$ $\rho$ . CN prediction.

Purpose

Purpose: compute

\rho

from

r^+

r^-

in Inorganic chemistry via

\\rho=r_+/r_-

CN prediction. 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

r^+ = 1.020\,\mathrm{Å}

r^- = 1.810\,\mathrm{Å}

, the governing relation

\\rho=r_+/r_-

yields

\rho = 0.564\,\mathrm{—}

. CN prediction. Move a slider: the numbers are this situation, not a canned story.

Calculator

Inputs

r+ r^+1.02 År- r^-1.81 Å

Outputs

ρ \rho0.564 —

Reading speed

Watch on YouTube

Free library

Full library

Free PDF / open book

YouTube channels

00:0 / 00:08

Narration of this film

CN prediction.

Reading speed

Watch on YouTube