62 
PHYSICS: B. DAVIS 
Proc. N. a. S. 
the results ^obtained for the above products. The values of the atomic 
diameters expressed in Angstrom units are repeated from Eve's paper 
which were taken from a list by Bragg. 
TABLE 1 
E I R D V^A. V. IXD I X V^A. v. (i — r) X D (l-R)'yyA. v. 
H 
13.8 
10.2 
2.45 1 
1 
1 33.8 
1 
8.82 
Group I 
Na 
5.13 
2.12 
3.58 
2.87 
18.1 
14.7 
10.74 
8.61 
K 
4.32 
1.55 
4.15 
3.57 
17.9 
15.4 
11.5 
9.64 
Rb 
4.15 
1 .55 
4.50 
3.81 
18.7 
15.9 
11 .7 
9.90 
Cs 
3 .9 
1 .48 
4 .75 
4.12 
18.4 
16 .0 
11 .5 
9 .97 
Range . 8 
1 .3 
1.00 
1.37 
Group II 
A 
Me 
7.61 
2.65 
2.85 
2.4 
21.7 
18.3 
14.14 
12.24 
Ca 
6.09 
1.90 
3.40 
2.96 
20.8 
18.0 
14.28 
12.16 
vSr 
5.67 
1.80 
3.90 
3.25 
22.2 
18.4 
15.2 
12.57 
Ba 
.19 
1.56 
4.20 
3.31 
21.8 
17.2 
15.25 
12.03 
Range 
1.4 
1.2 
1.11 
.54 
Group II B 
Zn 
9 .35 
4 .02 
2.65 
2.09 
24.77 
19 .5 
14.12 
11 .2 
PH 
v^u 
9. 
O . XJU 
o .zu 
2.35 
28.64 
91 0 
16.25 
12.12 
Hg 
10.38 
4.85 
2.45 
25.4 
13.47 
Range 3.87 
5.9 
2.13 
2.27 
Group III B 
Tl 
7 3 
1 .07 
4 .50 
2.58 
1 32.85 1 
18 8 11 
28. 1 16.07 
Group IV B 
Pb 
7.93 
1 .26 
3 .80 
2.63 
1 30.13 1 
20.8 1 
25.38 
1 17.54 
Group V A 
As 
11.5 
4.7 
2.52 
2.36 
29. 
27.2 
17.14 
16.00 
2.52 
29.0 
17.1 
P 
13.3 
5.8 
2.37 
31.5 
17.78 
2.57 
34.2 
19.27 
Range 
4.3 
1.78 
5.2 
2.17 
Group VI 
S 
12.2 
4.78 
2.05 
1 2.5 
1 25. 1 
30.4 I 
15.17 
1 18.5 
Group VII A 
I 
10.1 
2.34 
2.8 
2.95 1 
1 28.3 1 
29.8 11 
21.73 
22.9 
Inert Gases 
He 
25.6 
20.5 
2.86 
73. 
14.25 
Ne 
21.3 
16.9 
1.3 
2.67 
27.7 
42.8 
5.72 
13.33 
A 
15.5 
11.5 
2.05 
3.03 
31.77 
36.4 
8.2 
12.1 
Range 4.00 36.6 2.5 2.15 
