6
C
carbon
[12.00, 12.02]
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1
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18
1
H
hydrogen
[1.007, 1.009]
2
Key:
13
14
15
16
17
2
He
helium
4.003
3
Li
lithium
[6.938, 6.997]
4
Be
beryllium
9.012
atomic number
Symbol
name
standard atomic weight
5
B
boron
[10.80, 10.83]
7
N
nitrogen
[14.00, 14.01]
8
O
oxygen
[15.99, 16.00]
9
F
fluorine
19.00
10
Ne
neon
20.18
11
Na
sodium
22.99
12
Mg
magnesium
[24.30, 24.31]
3
4
5
6
7
8
9
10
11
12
13
Al
aluminium
26.98
14
Si
silicon
[28.08, 28.09]
15
P
phosphorus
30.97
16
S
sulfur
[32.05, 32.08]
17
Cl
chlorine
[35.44, 35.46]
18
Ar
argon
39.95
19
K
potassium
39.10
20
Ca
calcium
40.08
21
Sc
scandium
44.96
22
Ti
titanium
47.87
23
V
vanadium
50.94
24
Cr
chromium
52.00
25
Mn
manganese
54.94
26
Fe
iron
55.85
27
Co
cobalt
58.93
28
Ni
nickel
58.69
29
Cu
copper
63.55
30
Zn
zinc
65.38(2)
31
Ga
gallium
69.72
32
Ge
germanium
72.63
33
As
arsenic
74.92
34
Se
selenium
78.97
35
Br
bromine
[79.90, 79.91]
36
Kr
krypton
83.80
37
Rb
rubidium
85.47
38
Sr
strontium
87.62
39
Y
yttrium
88.91
40
Zr
zirconium
91.22
41
Nb
niobium
92.91
42
Mo
molybdenum
95.95
43
Tc
technetium
44
Ru
ruthenium
101.1
45
Rh
rhodium
102.9
46
Pd
palladium
106.4
47
Ag
silver
107.9
48
Cd
cadmium
112.4
49
In
indium
114.8
50
Sn
tin
118.7
51
Sb
antimony
121.8
52
Te
tellurium
127.6
53
I
iodine
126.9
54
Xe
xenon
131.3
55
Cs
caesium
132.9
56
Ba
barium
157.3
57-71
lanthanoids
72
Hf
hafnium
178.5
73
Ta
tantalum
180.9
74
W
tungsten
183.8
75
Re
rhenium
186.2
76
Os
osmium
190.2
77
Ir
iridium
192.2
78
Pt
platinum
195.1
79
Au
gold
197.0
80
Hg
mercury
200.6
81
Tl
thallium
[204.3, 204.4]
82
Pb
lead
207.2
83
Bi
bismuth
209.0
84
Po
polonium
85
At
astatine
86
Rn
radon
87
Fr
francium
88
Ra
radium
89-103
actinoids
104
Rf
ruthefordium
105
Db
dubnium
106
Sg
seaborgium
107
Bh
bohrium
108
Hs
hassium
109
Mt
meitnerium
110
Ds
darmstadtium
111
Rg
roentgenium
112
Cn
copernicium
113
Nh
nihonium
114
Fl
flerovium
115
Mc
moscovium
116
Lv
livermorium
117
Ts
tennessine
118
Og
oganesson
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
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2004
Technical Report
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2004
Technical Report
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2001
Technical Report
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2001
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1991
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Technical Report
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2013
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