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Periodic System of the Elements 
o 
I 
II 
III 
IV 
V 
VI 
VII 
vin 
H 1 
He 2 
Li 3 
Be or GI 4 
B 5 
G 6 
N 7 
O 8 
F 9 
Ne io 
Na ii 
Mg 12 
Al 13 
Si 14 
Pi5 
S 16 
Cl 17 
A* 18 
K* 19 
Ca 20 
Sc 21 
Ti 22 
V23 
Cr 24 
Mn 25 
Fe 26 Co* 27 Ni* 28 
Cu 29 
Zn 30 
Ga 31 
Ge 32 
As 33 
Se 34 
Br 35 
Nb or 
Kr 36 
Rb 37 
Sr 38 
Yt 39 
Zr 40 
Cb 41 
Mo 42 
Ma 43 
Ru 44 Rh 45 Pd 46 
A g 47 
Cd 48 
In 49 
Sn 50 
Sb 51 
Te* 52 
I* 53 
Xe 54 
Cs 55 
Ba 56 
The 57— 
Rare 
Earths 71 
Ha 72 
Ta 73 
w 74 
Re 75 
Os 76 Ir 77 Pt 78 
An 79 
Hg 80 
T1 81 
Pb 82 
Bi 83 
Po 84 
-85 
Rn or Nt 86 
—87 
Ra 88 
Ac 89 
Th 90 
Ux 2 91 
U 92 
Elements not placed in the order of the atomic weights. 
ATOMIC STRUCTURE