Specific Volumes of Oxides. 



63 



extend from 4*0 to 5*456; and accordingly the atomic volume 

 varies from 284 to 38*3. An oxide of barium of sp. gr. 6*4, 

 giving sp. vol. 24, might be expected to exist. 



Some interesting numbers are obtained if we calculate the 

 volume which one atom of oxygen possesses in the various 

 oxides. To commence with, we suppose that the metal does 

 not alter in volume when it combines with oxygen, we sub- 

 tract the specific volume of the metal from that of the oxide. 

 We quote the values from Lothar Meyer's ' Modern Theory of 

 Chemistry,' 4th edit. 1880, p. 141. To take an example, 



iNa 2 = ll'l, Na = 23'7, lM-23-7=-12'6 for i 0, 



or — 25'2 for 0, and so on. 



The following Table contains the corresponding numbers 

 when the elements are arranged according to the periodic law. 



Table II. 

 Specific Volume of one Atom of Oxygen in the Oxides. 



Groups 



I. 



II. 



III. 



IV. 



Series. 



E 2 0. J R 2 2 . 



R 2 3 . 



R 2 4 . 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



H 

 - 9-6 Li 

 -25-2iVa-25-2 

 -55-4 K 



Cu+10-4 

 (-70) Rb 



Ag+7-6 

 (-84) Cs 



"Au(+5) 



4- 2-7 Be 



- ISMg -1-8 



- 7-2 Ca 



Zu 4-5-1 

 -12'9 Sr 



Cd 4-5-5 



- 8-5 Ba 



"Hg 4-4-7 



4-8 B 



Al 4-1-4 

 (-0-7) Sc 



Ga (4-2-9) 

 (-0-7) Y 



In 4-2-5 

 4-1 '7 La 



"fl(+4) 



4-21-2 C 



Si + 5-7 

 (4-3) Ti 



-(+5) 

 4-0-8 Zr 



Sn +3-2 

 4-2-2 Ce 



"p'b" 4-3-7 



-1-8 Th 



Groups 



V. 



VI. 



VII. 



Series. 



R 2 5 . 



R 2 6 . 



R 2 7 . 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



N 



P +6-6 

 4-6-6 V 



As 4-7-0 

 4-6-6 Nb 



Sb 4-9-5 



4-4-8 Ta 



Bi +8-4 







S 4-8-3 

 + 9-3 Cr 



Se 



4-7-2 Mo 



Te 



+ 90 W 



Ng? 

 4-14-3 TJ 



F 

 CI 

 Mn 

 Br 



I 



