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Update 21 July 2010
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THE PERIODIC TABLE OF THE ELEMENTS
(Mendeleev's classification)

Move your mouse over the symbol to get the name and valence of the element

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Group I II IIIb IVb Vb VIb VIIb VIIIb Ib IIb III IV V VI VII VIII
Period
1 1
H
1.008
2
He
4.002
2 4
Be
9.01
6
C
12.01
7
N
14.01
8
O
16.00
10
Ne
20.17
3 11
Na
22.99
15
P
30.97
16
S
32.06
17
Cl
35.45
18
Ar
39.95
4 19
K
39.10
21
Sc
44.96
22
Ti
47.90
26
Fe
55.85
27
Co
58.93
31
Ga
69.72
32
Ge
72.59
35
Br
79.9
36
Kr
83.8
5 37
Rb
85.5
39
Y
88.9
40
Zr
91.2
41
Nb
92.9
42
Mo
95.9
43
Tc
98.9
44
Ru
101.1
45
Rh
102.9
46
Pd
106.4
49
In
114.8
50
Sn
118.7
52
Te
127.6
54
Xe
131.3
6 57 a)
La
138.9
72
Hf
178.5
73
Ta
180.9
74
W
183.8
75
Re
186.2
76
Os
190.2
77
Ir
192.2
81
Tl
204.4
83
Bi
209.0
84
Po
209
85
At
210
86
Rn
222
7 87
Fr
223
89 b)
Ac
227
104
Rf
261
105
Db
262
106
Sg
266
107
Bh
264
108
Hs
269
109
Mt
268
110
Ds
271
111
Rg
272
a) Lanthanides 58
Ce
140.1
59
Pr
140.9
60
Nd
144.2
61
Pm
145
62
Sm
150.4
63
Eu
152.0
64
Gd
157.2
65
Tb
158.9
66
Dy
162.5
67
Ho
164.9
68
Er
167.3
69
Tm
168.9
70
Yb
173.0
71
Lu
175.0
b) Actinides 90
Th
232
91
Pa
231
93
Np
237
94
Pu
244
95
Am
243
96
Cm
247
97
Bk
247
98
Cf
251
99
Es
254
100
Fm
257
101
Md
258
102
No
259
103
Lr
260
 
Keys to the table 1
H
1.008
Atomic number
Symbol of element
Atomic mass
 
Metals
(black)
 
Semi-metals
(blue)
 
Non-metals
(grey)
00
AA
00.00
 
Alkaline metals
 
The most common valence is shown
after the name of the element
in square brackets [n]
when you move your mouse
over the symbol
 
If the cell background changes
some IX information is available:
Dark grey: a few lines of explanation
(click the cell)
00
EE
00.00
 
Earth-alkalis
 
00
TT
00.00
 
Transition metals
 
00
MM
00.00
 
Other metals
 
00
XX
00.00
 
Halogens
 
00
OO
00.00
 
Noble gases
 

See the chemical compounds frequently seen in ion exchange applications, with their formula and name in five languages.

See also (external link) WebElements, the periodic table on the WWW. It has all details on each element, including a description, electronic configuration, isotopes, and most common compounds.



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