1
(1)
1
1
(1s)
H
(2s)
4
(5s)
(6s)
4.003
+1
+2
4
Li
Be
Lithium
Beryllium
Atomic number
12
7
Liquid at 25 °C
Zn Solid at 25 °C
He Gas at 25 °C
200.59
Atomic mass
5
Metal
Metalloid
Nonmetal
(2p)
Mg
Magnesium
K
Ca
Potassium
Calcium
21
(3d)
Rb
Sr
Rubidium
Strontium
Cs
Ba
Cesium
132.91
4
(4B)
+3
22
Sc
Ti
Scandium
Titanium
+2
+3
+4
5
(5B)
23
V
+2
+3
+4
+5
Vanadium
6
(6B)
24
Cr
+2
+3
+6
Chromium
7
(7B)
25
Mn
+2
+3
+4
+7
Manganese
8
(8B)
26
Fe
+2
+3
Iron
9
(8B)
27
Co
10
(8B)
+2
+3
28
Ni
Cobalt
+2
+3
Nickel
11
(11B)
29
Cu
+1
+2
Copper
12
(12B)
30
(3p)
C
Boron
Carbon
(4p)
Zinc
44.96
47.87
50.94
52.00
54.94
55.85
58.93
58.69
63.55
65.41
+4 41
+3 42
+6 43
+4 44
+3 45
+3 46
+2 47
+1 48
+2
39 +3 40
(4d)
Zr
Nb
Yttrium
Zirconium
Niobium
+6
+7
Mo
Tc
Molybdenum
Technetium
88.91
91.22
92.91
95.94
(98)
+4 73
+5 74
+6 75
71 +3 72
57-70
+4
+6
+7
+4
Ru
Rh
Pd
Ruthenium
Rhodium
Palladium
Ag
Cd
Silver
Cadmium
+4
+4
+4
+3
(5p)
Phosphorus
+4
Ga
Ge
Gallium
Germanium
In
+3
Indium
+2
P
10
O
F
Ne
Fluorine
Neon
16
S
19.00
−2
+4
+6
Sulfur
17
0
Cl
As
+3
+5
Chlorine
Arsenic
Se
+4
+6
Selenium
Sn
+4
Tin
Sb
+3
+5
18
Antimony
Te
Tellurium
+1
+5
I
Iodine
Ar
Kr
+1
+5
+7
+3
+4
+5
+4
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
137.33
174.97
178.49
180.95
183.84
186.21
190.23
192.22
195.08
196.97
200.59
204.38
207.2
208.98
(209)
(210)
(222)
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
Lr
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
(268)
(271)
(267)
(269)
(276)
Francium
Radium
Lawrencium
(223)
(226)
(262)
57
6
7
(4f)
(5f)
(6d)
+3
58
La
Ce
Lanthanum
Cerium
+3
+4
Ruthefordium
(267)
59
+3
Pr
60
+3
Nd
61
+3
62
+2
+3
65
+3
66
+3
67
+3
68
+3
69
+3
70
+2
+3
Dy
Ho
Er
Tm
Yb
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
138.91 140.12 140.91 144.24 (145)
150.36 151.96 157.25 158.93 162.50 164.93
89 +3 90 +4 91 +4 92 +3 93 +3 94 +3 95 +3 96 +3 97 +3 98 +3 99
167.26
100
168.93
101
173.04
102
Ac
Th
Pa
Actinium
Thorium
Protactinium
Uranium
(227)
232.04
231.04
238.03
+4
+5
+6
Np
+4
+5
+6
Pu
+4
+5
+6
Neptunium
Plutonium
(237)
(244)
Eu
+3
(280)
Tb
U
Samarium
64
Roentgenium
Gadolinium
+5
Sm
Promethium
+2
+3
(281)
Gd
Praseodymium Neodymium
Pm
63
Darmstadtium
(7p)
Europium
+4
+4
Am +5
Cm
+6
Bk
Cf
Es
Fm
Md
No
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
(243)
(247)
(247)
(251)
(252)
(257)
(258)
(259)
Masses are IUPAC 2005 standard atomic weights as approved at the 43rd IUPAC general assembly, August 2005 (to be published)
modified from Atomic Weights of the Elements 2001 (IUPAC technical report)
For elements that have no stable isotopes, mass in parenthesis indicates mass number of most stable isotope
Periodic Table of the Elements, Copyright © 2006, Peter A. Doucette
Po
At
131.29
0
86
Lutetium
**
Bi
Xe
Barium
89-102
Pb
0
Xenon
Re
Ra
Tl
0
Krypton
114.82 118.71 121.76 127.60 126.90
+2 83
+3 84
+2 85
+1 82
81
(6p)
0
Argon
Bromine
+4
+6
0
20.18
−1
+1
+5
+7
W
Fr
Au
Silicon
−1
Oxygen
16.00
−3
+3
+5
9
Ta
+2
Pt
Si
Aluminum
15
−2
Hf
(5d)
Ir
Al
14.01
−4
+2
+4
8
69.72
72.64
74.92
78.96
79.90
83.80
−1 54
+1 50
+2 51
−3 52
−2 53
49
101.07 102.91 106.42 107.87 112.41
+3 78
+2 79
+1 80
+1
76 +3 77
Os
14
N
−3
+5
Nitrogen
12.01
+3
7
Lu
88
*
Y
+5
−4
+2
+4
26.98
28.09
30.97
32.07
35.45
39.95
+3 32
+2 33
−3 34
−2 35
−1 36
31
+2
Zn
6
B
13
3
(3B)
+3
10.82
+2
Sodium
+1
Oxidation states
+1
+2
Mercury
9.012
+1
80
Elemental symbol
Na
87
(7s)
18
(8)
Helium
85.47
87.62
+2
55 +1 56
6
17
(7)
He
39.10
40.08
37 +1 38 +2
5
16
(6)
2
22.99
24.31
19 +1 20 +2
(4s)
15
(5)
1.008
11
(3s)
14
(4)
−1
+1
6.941
3
13
(3)
Hydrogen
3
2
Periodic Table of the Elements
2
(2)
Rn