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H
He
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
Si
P
S
Cl
Ar
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Cs
Ba
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Fr
Ra
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Cn
Nh
Fl
Mc
Lv
Ts
Og
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
1
IA
2
IIA
3
IIB
4
IVB
5
VB
6
VIB
7
VIIB
8
VIIIB -
9
- VIIIB -
10
- VIIIB
11
IB
12
IIB
13
IIIA
14
IVA
15
VA
16
VIA
17
IA
18
VIIIA
1
K
1


1
H
Hydrogen
1.008
H
Ax
Atomic Mass
Half Life
Isotope Occurance
Help
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H

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H
2


2
He
Helium
4.026
H
2
L
3


2
1
Li
Lithium
6.94
H
4


2
2
Be
Beryllium
9.0122
H
7S
6S
5S
4S
3S
2S
1S
11
11
11
11
11
11
11
7P
6P
5P
4P
3P
2P
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11
11
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11
11
 
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11
11
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11
11
 
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11
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11
11
11
 
6D
5D
4D
3D
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11
11
11
11
 
 
11
11
11
11
 
 
11
11
11
11
 
 
11
11
11
11
 
 
11
11
11
11
 
 
5F
4F
 
 
 
11
11
 
 
 
11
11
 
 
 
11
11
 
 
 
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11
 
 
 
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11
 
 
 
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11
 
 
 
11
11
 
 
 
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
1
H
H
H
H
5


2
3
B
Boron
10.81
H
6


2
4
C
Carbon
12.011
H
7


2
5
N
Nitrogen
14.007
H
8


2
6
O
Oxygen
15.999
H
9


2
7
F
Fluorine
18.988
H
10


2
8
Ne
Neon
20.180
H
3
M
11


2
8
1
Na
Sodium
22.990
H
12


2
8
2
Mg
Magnesium
24.305
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
13


2
8
3
Al
Aluminium
26.982
H
14


2
8
4
Si
Silicon
28.085
H
15


2
8
5
P
Phosphorus
30.975
H
16


2
8
6
S
Sulfur
32.06
H
17


2
8
7
Cl
Chlorine
35.45
H
18


2
8
8
Ar
Argon
39.948
H
4
N
19


2
8
8
1
K
Potassium
39.098
H
20


2
8
8
2
Ca
Calcium
40.078
H
21


2
8
9
2
Sc
Scandium
44.956
H
22


2
8
10
2
Ti
Titanium
47.867
H
23


2
8
11
2
V
Vanadium
50.942
H
24


2
8
13
1
Cr
Chromium
51.996
H
25


2
8
13
2
Mn
Manganese
54.938
H
26


2
8
14
2
Fe
Iron
55.845
H
27


2
8
15
2
Co
Cobalt
58.933
H
28


2
8
16
2
Ni
Nickel
58.693
H
29


2
8
18
1
Cu
Copper
63.546
H
30


2
8
18
2
Zn
Zinc
65.38
H
31


2
8
18
3
Ga
Gallium
69.723
H
32


2
8
18
4
Ge
Germanium
72.63
H
33


2
8
18
5
As
Arsenic
74.922
H
34


2
8
18
6
Se
Selenium
78.96
H
35


2
8
18
7
Br
Bromine
79.904
H
36


2
8
18
8
Kr
Krypton
83.789
H
5
O
37


2
8
18
8
1
Rb
Rubidium
85.468
H
38


2
8
18
8
2
Sr
Strontium
87.62
H
39


2
8
18
9
2
Y
Yttrium
88.906
H
40


2
8
18
10
2
Zr
Zirconium
91.224
H
41


2
8
18
12
1
Nb
Niobium
92.906
H
42


2
8
18
13
1
Mo
Molybdenum
95.96
H
43


2
8
18
13
2
Tc
☢
Technetium
[97.91]
H
44


2
8
18
15
1
Ru
Ruthenium
101.07
H
45


2
8
18
16
1
Rh
Rhodium
102.91
H
46


2
8
18
18
Pd
Palladium
106.42
H
47


2
8
18
18
1
Ag
Silver
107.87
H
48


2
8
18
18
2
Cd
Cadmium
112.41
H
49


2
8
18
18
3
In
Indium
114.82
H
50


2
8
18
18
4
Sn
Tin
118.71
H
51


2
8
18
18
5
Sb
Antimony
121.76
H
52


2
8
18
18
6
Te
Tellurium
127.60
H
53


2
8
18
18
7
I
Iodine
126.90
H
54


2
8
18
18
8
Xe
Xenon
131.29
H
6
P
55


2
8
18
18
8
1
Cs
Caesium
132.91
H
56


2
8
18
18
8
2
Ba
Barium
137.33
H
72


2
8
18
36
10
2
Hf
Hafnium
178.49
H
73


2
8
18
36
11
2
Ta
Tantalum
180.95
H
74


2
8
18
36
12
2
W
Tungsten
183.84
H
75


2
8
18
36
13
2
Re
Rhenium
186.21
H
76


2
8
18
36
14
2
Os
Osmium
190.23
H
77


2
8
18
36
15
2
Ir
Iridium
192.22
H
78


2
8
18
36
17
1
Pt
Platinum
195.08
H
79


2
8
18
36
18
1
Au
Gold
196.97
H
80


2
8
18
36
18
2
Hg
Mercury
200.38
H
81


2
8
18
36
18
3
Tl
Thallium
204.38
H
82


2
8
18
36
18
4
Pb
Lead
207.2
H
83
(☢)


2
8
18
36
18
5
Bi
Bismuth
208.98
H
84
☢


2
8
18
36
18
6
Po
Polonium
[208.98]
H
85
☢


2
8
18
36
18
7
At
Astatine
[209.99]
H
86
☢


2
8
18
36
18
8
Rn
Radon
[222.02]
H
7
Q
87
☢


2
8
18
36
18
8
1
Fr
Francium
[223.92]
H
88
☢


2
8
18
36
18
8
2
Ra
Radium
[226.03]
H
104
☢


2
8
18
36
18
10
2
Rf
Rutherfordium
[265.12]
H
105
☢


2
8
18
36
18
11
2
Db
Dubnium
[268.13]
H
106
☢


2
8
18
36
18
12
2
Sg
Seaborgium
[271.13]
H
107
☢


2
8
18
36
18
13
2
Bh
Bohrium
[270]
H
108
☢


2
8
18
36
18
14
2
Hs
Hassium
[277.15]
H
109
☢


2
8
18
36
18
15
2
Mt
Meitnerium
[276.15]
H
110
☢


2
8
18
36
18
17
1
Ds
Darmstadtium
[281.16]
H
111
☢


2
8
18
36
18
17
2
Rg
Roentgenium
[280.16]
H
112
☢


2
8
18
36
18
18
2
Cn
Copernicium
[285.17]
H
113
☢


2
8
18
36
18
18
3
Nh
Nihonium
[286]
H
114
☢


2
8
18
36
18
18
4
Fl
Flerovium
[289]
H
115
☢


2
8
18
36
18
18
5
Mc
Moscovium
[290]
H
116
☢


2
8
18
36
18
18
6
Lv
Livermorium
[293]
H
117
☢


2
8
18
36
18
18
7
Ts
Tennessine
[294]
H
118
☢


2
8
18
36
18
18
8
Og
Oganesson
[294]
H
Alkali Metals
Alkali Earth Metals
S Block
Transition Metals
F Block
Transactinide
Rare Earth
Refractory Metals
Major Actinides
Nobel Metals
Minor Actinides
Precious Metals
Platinum Group
D Block
P Block
Post Transition
Metalloids
Non Metals
Nobel Gasses
Lanthanide
57


2
8
18
18
9
2
La
Lanthanum
138.91
H
58


2
8
18
19
9
2
Ce
Cerium
140.12
H
59


2
8
18
21
8
2
Pr
Praseodymium
140.91
H
60


2
8
18
22
8
2
Nd
Neodymium
144.24
H
61
☢


2
8
18
23
8
2
Pm
Promethium
[144.91]
H
62


2
8
18
24
8
2
Sm
Samarium
150.36
H
63


2
8
18
25
8
2
Eu
Europium
151.96
H
64


2
8
18
25
9
2
Gd
Gadolinium
157.25
H
65


2
8
18
27
8
2
Tb
Terbium
158.93
H
66


2
8
18
28
8
2
Dy
Dysprosium
162.50
H
67


2
8
18
29
8
2
Ho
Holmim
164.93
H
68


2
8
18
30
8
2
Er
Erbium
167.26
H
69


2
8
18
31
8
2
Tm
Thulium
168.93
H
70


2
8
18
32
8
2
Yb
Ytterbium
173.05
H
71


2
8
18
32
9
2
Lu
Lutetium
174.97
H
Actinides
89
☢


2
8
18
32
18
9
2
Ac
Actinium
[227.03]
H
90
☢


2
8
18
32
18
10
2
Th
Thorium
232.04
H
91
☢


2
8
18
32
20
9
2
Pa
Protactinium
231.04
H
92
☢


2
8
18
32
21
9
2
U
Uranium
238.03
H
93
☢


2
8
18
32
22
9
2
Np
Neptunium
[237.05]
H
94
☢


2
8
18
32
24
8
2
Pu
Plutonium
[244.06]
H
95
☢


2
8
18
32
25
8
2
Am
Americium
[243.06]
H
96
☢


2
8
18
32
25
9
2
Cm
Curium
[247.07]
H
97
☢


2
8
18
32
27
8
2
Bk
Berkelium
[247.07]
H
98
☢


2
8
18
32
28
8
2
Cf
Californium
[251.08]
H
99
☢


2
8
18
32
29
8
2
Es
Einsteinium
[252.08]
H
100
☢


2
8
18
32
30
8
2
Fm
Fermium
[257.10]
H
101
☢


2
8
18
32
31
8
2
Md
Mendelevium
[258.10]
H
102
☢


2
8
18
32
32
8
2
No
Nobelium
[259.10]
H
103
☢


2
8
18
32
29
32
3
Lr
Lawrencium
[262.11]
H
R : No Stable Isotope, Mass is for the isotope with longest half life   1 : Commercial lithiums atomic weight varies between 6.939 and 6.996   2 : Geological samples are known to exist that differs significantl from the stated value   3 : Commercial material may differ significantly from stated value due to having differing isotopic composition from undisclosed or inadvertent isotopic fractionation   4 : Isotopic composition varies significantly in natural oor normal terrestrial material and therefore limits precision of the value given