ANTIMONY Sb      Z = 51

This element was already known in antiquity. The name alludes to the Greek words anti and monos (not alone). In Latin this element is called stibium .

Ionization energies

SbI 8.6 eV, SbII 18.6 eV.

Absorption lines of SbI

The equivalent width of SbI 3267(2) in the sun is 0.011.


There exist 29 isotopes and isomers. The two stable isotopes are Sb121 and Sb123. In the solar system their abundances are respectively 57% and 43% .


SB121 can be produced by the r and s processes whereas SB123 is a pure r process product.

Published in "The Behavior of Chemical Elements in Stars", Carlos Jaschek and Mercedes Jaschek, 1995, Cambridge University Press.