Dr. H. Wilde on tJw Atomic Weight of Radium. 281 
Hn. 
H2n. 
H = 1 Diff. 
He= 2 Diff. 
- 6 
- 6 
. . 7 Li = 7 
0.0. 8 = ai= 8 
0-59 t 7 * 
-16 
1-64? 9-2 
-16 
1x23. = ]\ T a= 23 
lx24-0 = Mg = 24 
0'98 23 
-16 
1-74 24 
-16 
2x23-7 = Ka= 39 
2 x 24-8 = Ca= 40 
0-86 39 
-23 
1-58 40 
-24 
3x23-7 = Cu = 62 
3x24— 8 = Zn= 64 
8-9 63-3 
-23 
7-2 65 
-24 
4x23-7=E,b= 85 
4x24-8 = Sr = 88 
1-52 85 
-23 
2-54 87-5 
-24 
5x23-7 = Ag=108 
5x24-8 = Cd=112 
10-6 108 
-23 
8-69 112 
-24 
6x23-7 = Cs =131 
6x24-8=Ba=136 
1-38 132 
-23 
3-75 137 
-24 
7x23-7= — = 154 
7x24-8= — =160 
12-2J 
-23 
10-13 I 
-24 
8x23-7= — = 177 
8x24-8 = Ea=184 
22 I 
-23 
5-OJ 
-24 
9x23-7 = Hg = 200 
9x24-8=Pb = 208 
13-6 200 
11-44 207 
* Accepted Atomic Weights, f 
Specific Gravities. % Estimated 
I have previously shown that the positive series of elements 
H2n closes with lead (208), and that i£ any higher member 
of the series of alkaline-earth metals exist, it would have an 
