Light Metals
Nonmetals
GROUP
1
2
3
4
5
6
7
8
PERIOD
1
H
He
Hydrogen
Helium
1.008
4.003
1
2
2
Li
Be
B
C
N
O
F
Ne
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
6.94
9.013
10.82
12.011
14.008
16
19
20.183
3
4
5
6
7
8
9
10
3
Na
Mg
Transition Metals
Al
Si
P
S
Cl
Ar
Sodium
Magnesium
Aluminum
Silicon
Phosphorus
Sulfur
Chlorine
Argon
22.991
24.32
26.98
28.09
30.975
32.066
35.457
39.944
11
12
13
14
15
16
17
18
4
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
39.1
40.08
44.96
47.9
50.95
52.01
54.94
55.85
58.94
58.71
63.54
65.38
69.72
72.6
74.91
78.96
79.916
83.8
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
5
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
85.48
87.63
88.92
91.22
92.91
95.95
99
101.1
102.91
106.4
107.88
112.41
114.82
118.7
121.76
127.61
126.91
131.3
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
6
Cs
Ba
Lu
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Cesium
Barium
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
132.91
137.56
174.99
178.5
180.95
183.86
186.22
190.2
192.2
195.09
197
200.61
204.39
207.21
209
210
(210)
(222)
55
56
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
7
Fr
Ra
Lw
Rf
Db
Sg
Bh
Hs
Mt
*
*
*
**
**
**
**
**
**
Francium
Radium
Lawrencium
Ruthenium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
(223)
226.05
(260)
(261)
(262)
(263)
(262)
(265)
(266)
(269)
(272)
87
88
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
(***
Atomic
Weights
in
parentheses indicate
the
weight
of
the
most
stable
isotope)
** Elements found i
n 2000
* Elements discover
ed but not yet officially named
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
138.92
140.13
140.92
144.27
145
150.35
152
157.26
158.93
162.51
164.94
167.27
168.94
173.4
57
58
59
60
61
62
63
64
65
66
67
68
69
70
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
227
232.05
231
238.07
237
242
243
245
249
249
255
255
256
253
89
90
91
92
93
94
95
96
97
98
99
100
101
102
990304c.xls
