1
H
hydrogen
[1.007, 1.009]
1 18
3
Li
lithium
[6.938, 6.997]
4
Be
beryllium
9.012
11
Na
sodium
22.99
12
Mg
magnesium
[24.30, 24.31]
19
K
potassium
39.10
20
Ca
calcium
40.08
37
Rb
rubidium
85.47
38
Sr
strontium
87.62
38
Sr
strontium
87.62
55
Cs
caesium
132.9
55
Cs
caesium
132.9
56
Ba
barium
137.3
87
Fr
francium
88
Ra
radium
5
B
boron
[10.80, 10.83]
13
Al
aluminium
26.98
31
Ga
gallium
69.72
49
In
indium
114.8
81
Tl
thallium
[204.3, 204.4]
6
C
carbon
[12.00, 12.02]
14
Si
silicon
[28.08, 28.09]
32
Ge
germanium
72.63
50
Sn
tin
118.7
82
Pb
lead
207.2
7
N
nitrogen
[14.00, 14.01]
15
P
phosphorus
30.97
33
As
arsenic
74.92
51
Sb
antimony
121.8
83
Bi
bismuth
209.0
8
O
oxygen
[15.99, 16.00]
16
S
sulfur
[32.05, 32.08]
34
Se
selenium
78.97
52
Te
tellurium
127.6
84
Po
polonium
9
F
fluorine
19.00
17
Cl
chlorine
[35.44, 35.46]
35
Br
bromine
[79.90, 79.91]
53
I
iodine
126.9
85
At
astatine
10
Ne
neon
20.18
2
He
helium
4.003
18
Ar
argon
39.95
36
Kr
krypton
83.80
54
Xe
xenon
131.3
86
Rn
radon
22
Ti
titanium
47.87
22
Ti
titanium
47.87
40
Zr
zirconium
91.22
72
Hf
hafnium
178.5
104
Rf
rutherfordium
23
V
vanadium
50.94
41
Nb
niobium
92.91
73
Ta
tantalum
180.9
105
Db
dubnium
24
Cr
chromium
52.00
24
Cr
chromium
52.00
42
Mo
molybdenum
95.95
74
W
tungsten
183.8
106
Sg
seaborgium
25
Mn
manganese
54.94
43
Tc
technetium
75
Re
rhenium
186.2
107
Bh
bohrium
26
Fe
iron
55.85
44
Ru
ruthenium
101.1
76
Os
osmium
190.2
108
Hs
hassium
27
Co
cobalt
58.93
45
Rh
rhodium
102.9
77
Ir
iridium
192.2
109
Mt
meitnerium
28
Ni
nickel
58.69
46
Pd
palladium
106.4
78
Pt
platinum
195.1
110
Ds
darmstadtium
29
Cu
copper
63.55
47
Ag
silver
107.9
79
Au
gold
197.0
30
Zn
zinc
65.38(2)
48
Cd
cadmium
112.4
80
Hg
mercury
200.6
111
Rg
roentgenium
112
Cn
copernicium
114
Fl
flerovium
113
Uut
ununtrium
115
Uup
ununpentium
117
Uus
ununseptium
118
Uuo
ununoctium
116
Lv
livermorium
57
La
lanthanum
138.9
58
Ce
cerium
140.1
59
Pr
praseodymium
140.9
60
Nd
neodymium
144.2
61
Pm
promethium
62
Sm
samarium
150.4
63
Eu
europium
152.0
64
Gd
gadolinium
157.3
65
Tb
terbium
158.9
66
Dy
dysprosium
162.5
67
Ho
holmium
164.9
68
Er
erbium
167.3
69
Tm
thulium
168.9
70
Yb
ytterbium
173.0
71
Lu
lutetium
175.0
89
Ac
actinium
90
Th
thorium
232.0
91
Pa
protactinium
231.0
92
U
uranium
238.0
93
Np
neptunium
94
Pu
plutonium
95
Am
americium
96
Cm
curium
97
Bk
berkelium
98
Cf
californium
99
Es
einsteinium
100
Fm
fermium
101
Md
mendelevium
102
No
nobelium
103
Lr
lawrencium
21
Sc
scandium
44.96
39
Y
yttrium
88.91
57-71
lanthanoids
89-103
actinoids
atomic number
Symbol
standard atomic weight
2 13 14 15 16 17Key:
3 4 5 6 7 8 9 10 11 12
name
For notes and updates to this table, see www.iupac.org. This version is dated 8 January 2016.
Copyright © 2016 IUPAC, the International Union of Pure and Applied Chemistry.
IUPAC Periodic Table of the Elements