240 
Det periodiske 
Gruppe 0 
Gruppe I 
Gruppe II 
Gruppe III 
Gruppe IV 
Vandstof 
Helium 
Lithium 
Beryllium 
Bor 
Kulstof 
H. 1.008 
He 3.99 
Li 6.94 
Be 9.1 
B 11.0 
C 12.00 
Neon 
Natrium 
Magnesium 
Aluminium 
Silicium 
Ne 20.2 
Na 23.00 
Mg 24.32 
Al 27.1 
Si 28.3 
A 
Argon 
Kalium 
Calcium 
_ 
Scandium 
Titan 
A 39.88 
K 39.10 
Ca 40.07 
Sc 44.1 
Ti 48.1 
B 
Kobber 
Zink 
Gallium 
Germanium 
Cu 63.57 
Zn 65.37 
Ga 69.9 ! 
Ge 72.5 
A 
Krypton 
Rubidium 
Strontium 
Yttrium 
Zircon 
' Kr 82.92 
Rb 85.45 
Sr 87.63 
Yt 89.0 
Zr 90.6 
B 
Sølv 
Cadmium 
Indium ! 
Tin 
Ag 107.88 
Cd 112.40 
In 114.8 
1 
Sn 119.0 
A 
Xenon 
Cæsium 
Barium 
Lanthan 
Cer 
Xe 130.2 
Cs 132.81 
Ba 137.37 
La 139.0 
Ce 140.25 
Europium Gadolinium Terbium 
Eu 152.0 Gd 157.3 Tb 159.2 
Thulium Ytterbium Lutecium 
Tm 168.5 Yb 172.0 Lu 174.0 
B 
! 
, 
Guld 
An 197.2 
i 
Kviksølv 
Hg 200.6 
Thallium 
TI 204.0 
Bly 
Pb 207.15 
A 
Radium 
Emanation 
Ra Em 222 
Radium 
Ra 226.0 
(Actinium) 
Thorium 
Th 232.1 
