F. W. Clarke on Atomic volumes of Liquids. 189 
as the atomic volume. This is exactly three times 8°6, our 
starting point for this group. The number obtained for anti- 
mony, 33°3, it will be seen lacks 1-1 of a multiple of 8°6. But 
of the six compounds of antimony from which I calculated, 
two contain chlorine, and two bromine. 
n my calculation I employed Kopp’s values for those ele- 
ments. If, however, the altered numbers are the true atomic 
volumes of chlorine and bromine, then we must re-calculate the 
atomic volume of antimony. Doing this, using the altered 
values for chlorine and bromine, we obtain as the atomic vol- 
ume of antimony, the number 34:2. If we take the atomic 
volumes actually found for the chlorid and bromid of anti- 
mony, and from them determine the value of antimony, using 
the new numbers for chlorine and bromine, we obtain a mean 
of 345, 34-4 is just four times §°6! This seems to lend ad- 
ditional strength to the idea that the chlorine group of ele- 
ments have atomic volumes which are multiples by whole num- 
bers of that of hydrogen. 
f, however, we re-calculate the atomic volume of antimony 
on the basis of new values for chlorine and bromine (iodine also, 
Whenever necessary), we must do the same for boron and the 
elements classed with it. Doing this, we obtain the number 
“x - variation of only 0-6 from the multiple of 8 6 previously 
ound, 
In making these corrections it must be borne in mind that 
Whenever the atomic volume of an element is deduced from the 
Passing now to the oxygen oup, we have two atomic vol- 
We hia Shs Between these 
Vv 
‘etween these two I have found no relation, but the lower one 
varies only 0-8 from three times 7°8. For selenium I obtained 
the number 23:2, only 0-2 less than the same multiple ot 78. 
Hence it seems very probable that the true lower atomic vol- 
ume for sulphur and selenium is 23°4 
