298 
D, = 4,894 + 1,275 X 2.065 (0,1083 —0,4927) — 3,882, 
because at — 188° U. = 85° abs. the value of 7m is = 0,1083, m, =0,4927 
being calculated. For Dy, we have assumed the value J,275*) (1,34 
is given somewhere as “calculated”. For v, we therefore find 
wdd", 1% 
For the factor f, we calculate further: 
j= 2005/1 a x 0498 | = 2,065 (10,250) = 1,545. 
id’ ni 
Because of this bj becomes — 145,9 .10-5X 1,548 = 225,9. 105, 
220.10? being found from the compounds. The value for D, 
calculated only by approximation is therefore, probably, slightly — / 
too low. | 
At last we calculate for the product fu: 
Fie 1048 A0 S14 
These products are therefore not constant for the Halogen group 
either. From 3,8(?) with F, fu, steadily decreases to 3,4 with Cl,, 
3,2 for Br,, and 3,14 for I,. Yet (leaving F, out of consideration) 
the decrease is not very great, so that we may possibly assume a 
middle value of 3,2. 
In the following table the fundamental values of the group have 
again been combined. The values of v, and bj. always refer to 1 atom. 
TABLE B, 
| kN End | | 1056, | 1056 
A A) | D A| 105 v, ino Ae Ai {| R | ‘ps 
ea! NY boi 1 Dig 020412 : ne ee haere calculated found 
| | | | | 
140 AM = — — ly ===<1-0,733)|, 0301.) 1,262. — (55) 
35,46 2,09 | 1,721 20,61 91,96 | 0,850 0,888! 0,411 1,319 | 127 \125,5(115) 
79,92 | 2,28 | 3,213 2487 111,0 || — 0,956) 0,462) 1,480 | 164 (165) 
| | | | 
126,92 | 2,39 | 3,882 32,69 145,9 | — 1,032] 0,493 1,548 | 226 | (220) 
+216  \254 | — | — = ;—-};—-}—-}{—-] - | - 
| | | | | | 
The values of 6, “found” placed between brackets could not be 
determined directly from 7%, and jx, as pr is unknown; they are 
the values which were formerly calculated from the compounds 
1) With bj, = 220.10-5, y=1,032 we really find v, =220X1,969X10-5, 
hence Dy, = 126,92 : (220 X 1,969  0,22412) = 1,307. With D = 4,894 at —188°C. 
(m = 0,083) the value 2,447: 1,920 = 1,275 is found for Dy. We have preferred 
this latter value. 
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