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2
IUPAC Periodic Table of the Elements
H
He helium hydrogen
[1.007; 1.009]
2
3
4
Li
beryllium
9.012
11
14
15
16
17
4.003
5
atomic number
Be
lithium
[6.938; 6.997]
13
Key:
6
7
8
9
10
O
F
Ne
boron
carbon
nitrogen
oxygen
fluorine
neon
[10.80; 10.83]
B
[12.00; 12.02]
[14.00; 14.01]
[15.99; 16.00]
19.00
20.18
12
13
14
15
16
17
18
Na
Mg
Al
Si
P
S
Cl
Ar
sodium
magnesium
4
5
6
7
8
9
10
11
12
silicon
phosphorus
sulfur
chlorine
argon
24.31
3
aluminium
22.99
26.98
[28.08; 28.09]
30.97
[32.05; 32.08]
[35.44; 35.46]
39.95
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Symbol name standard atomic weight
C
N
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
39.10
40.08
44.96
47.87
50.94
52.00
54.94
55.85
58.93
58.69
63.55
65.38(2)
69.72
72.63
74.92
78.96(3)
79.90
83.80
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
technetium
ruthenium
rhodium
palladium
silver
cadmium
indium
tin
antimony
tellurium
iodine
xenon
101.1
102.9
106.4
107.9
112.4
114.8
118.7
121.8
127.6
126.9
131.3
rubidium
strontium
yttrium
zirconium
niobium
molybdenum
85.47
87.62
88.91
91.22
92.91
95.96(2)
55