ATOMIC WEIGHTS 487 



SCANDIUM. 



Cleve/ who was the first to make accurate experiments on the atomic 

 weight of this metal, obtained the following data : 1.451 grm. of sulphate, 

 ignited, gave .5293 grm. of SC2O3. .4479 grm. of ScoOg, converted into 

 sulphate, yielded 1.2255 grm. of the latter, which, upon ignition, gave 

 .4479 grm. of SC0O3. Hence, for the percentage of ScoOj in Sc. (80^)3 

 we have : 



36.478 

 36.556 

 36.556 



Mean, 36.530, ± .0175 



Hence Sc = 45.12. 



Later results are those of ISTilson,' who converted scandium oxide into 

 the sulphate. I give in a third column the percentage of oxide in sulphate : 



.3379 grm. Sc^Os gave .9343 grm. 8(^.(80 J,. 36.166 per cent. 



.3015 " .8330 " 36.194 



.2998 " .8257 " 36.187 



.3192 " .8823 " 36.178 



Mean, 36.181, ± .004 



Hence Sc = 44.09. 



Combining the two series, we have — 



Cleve 36.530, ± .0175 



Nilson 36.181, ± .0040 



General mean 36.190, ± .0039 



Hence, if 8 = 32.0667, ±.00075, 8c = 44.115, ±.0085. 



iCompt. Rend., 89, 419. 

 2Compt. Rend., 91, US. 



