﻿of Carbon Oxy sulphide and Carbon Bisidplride. 295 



the mean collision areas of the constituent configurations 

 (which we are taking- to be those of neon and argon) are 

 known, and it is usual to regard these symmetrical inert 

 atoms as behaving as clastic spheres for purposes of collision. 

 The radii of these collision spheres, as we may call them 

 for the sake of precision, are 1*15 A and 1*44 A respectively, 

 and they are considerably larger than those of the corre- 

 sponding outer electron shells, so that they overlap when 



Fig. 1. — Molecular Dimensions from the point of view 

 of the Kinetic Theory. 



The Carbon Dioxide Molecule: equivalent to three linked atoms of Neon, 



The Carbon Oxysulphide Molecule : equivalent to two Neon atoiris and 

 one Argon atom linked together. 



The Carbon Bisulphide Molecule : equivalent to two Argon atom® 

 linked together by one Neon atom. 



the nuclei are separated by the distances demanded by 

 electron sharing. Fig. 1 shows three models, drawn to scale, 

 representing what we may conceive C0 2 , COS, and 0S 2 to 

 be like for purposes of intermolecular encounters. C0 2 may 

 be regarded as three overlapping spheres,- each of the neon 



