1
H
Hydrogen
1.008
1
2
He
Helium
4.00
2
3
Li
Lithium
6.94
3
4
Be
Beryllium
9.01
2
2
5
B
Boron
10.81
2
3
6
C
Carbon
12.01
2
4
7
N
Nitrogen
14.01
2
5
8
O
Oxygen
16.00
2
6
9
F
Flourine
19.00
2
7
10
Ne
Neon
20.18
2
8
11
Na
Sodium
22.99
2
8
1
12
Mg
Magnesium
24.30
2
8
2
13
Al
Aluminium
26.98
2
8
3
14
Si
Silicon
28.09
2
8
4
15
P
Phosphorus
30.97
2
8
5
16
S
Sulfur
32.06
2
8
6
17
Cl
Chlorine
35.45
2
8
7
18
Ar
Argon
39.95
2
8
8
19
K
Potassium
39.10
2
8
8
1
20
Ca
Calcium
40.08
2
8
8
2
21
Sc
Scandium
44.96
2
8
9
2
22
Ti
Titanium
47.87
2
8
10
2
23
V
Vanadium
50.94
2
8
11
2
24
Cr
Chromium
52.00
2
8
13
1
25
Mn
Manganese
54.94
2
8
13
2
26
Fe
Iron
55.85
2
8
14
2
27
Co
Cobalt
58.93
2
8
15
2
28
Ni
Nickel
58.69
2
8
16
2
29
Cu
Copper
63.55
2
8
18
1
30
Zn
Zinc
65.38
2
8
18
2
31
Ga
Gallium
69.72
2
8
18
3
32
Ge
Germanium
72.63
2
8
18
4
33
As
Arsenic
74.92
2
8
18
5
34
Se
Selenium
78.97
2
8
18
6
35
Br
Bromine
79.90
2
8
18
7
36
Kr
Krypton
83.80
2
8
18
8
37
Rb
Rubidium
85.47
2
8
18
8
1
38
Sr
Strontium
87.62
2
8
18
8
2
39
Y
Yttrium
88.91
2
8
18
9
2
40
Zr
Zirconium
91.22
2
8
18
10
2
41
Nb
Niobium
92.91
2
8
18
12
1
42
Mo
Molybdenum
95.95
2
8
18
13
1
43
Tc
Technetium
(97)
2
8
18
13
2
44
Ru
Ruthenium
101.1
2
8
18
15
1
45
Rh
Rhodium
102.91
2
8
18
16
1
46
Pd
Palladium
106.42
2
8
18
18
47
Ag
Silver
107.87
2
8
18
18
1
48
Cd
Cadmium
112.41
2
8
18
18
2
49
In
Indium
114.82
2
8
18
18
3
50
Sn
Tin
118.71
2
8
18
18
4
51
Sb
Antimony
121.76
2
8
18
18
5
52
Te
Tellurium
127.60
2
8
18
18
6
53
I
Iodine
126.90
2
8
18
18
7
54
Xe
Xenon
131.29
2
8
18
18
8
55
Cs
Caesium
132.91
2
8
18
18
8
1
56
Ba
Barium
137.33
2
8
18
18
8
2
57
La
Lanthanum
138.91
2
8
18
18
9
2
58
Ce
Cerium
140.12
2
8
18
19
9
2
59
Pr
Praseodymium
140.91
2
8
18
21
8
2
60
Nd
Neodymium
144.24
2
8
18
22
8
2
61
Pm
Promethium
(145)
2
8
18
23
8
2
62
Sm
Samarium
150.4
2
8
18
24
8
2
63
Eu
Europium
151.97
2
8
18
25
8
2
64
Gd
Gadolinium
157.25
2
8
18
25
9
2
65
Tb
Terbium
158.93
2
8
18
27
8
2
66
Dy
Dysprosium
162.50
2
8
18
28
8
2
67
Ho
Holmium
164.93
2
8
18
29
8
2
68
Er
Erbium
167.26
2
8
18
30
8
2
69
Tm
Thulium
168.93
2
8
18
31
8
2
70
Yb
Ytterbium
173.05
2
8
18
32
8
2
71
Lu
Lutetium
174.97
2
8
18
32
9
2
72
Hf
Hafnium
178.49
2
8
18
32
10
2
73
Ta
Tantalum
180.95
2
8
18
32
11
2
74
W
Tungsten
183.84
2
8
18
32
12
2
75
Re
Rhenium
186.21
2
8
18
32
13
2
76
Os
Osmium
190.2
2
8
18
32
14
2
77
Ir
Iridium
192.2
2
8
18
32
15
2
78
Pt
Platinum
195.08
2
8
18
32
17
1
79
Au
Gold
196.97
2
8
18
32
18
1
80
Hg
Mercury
200.59
2
8
18
32
18
2
81
Tl
Thallium
204.38
2
8
18
32
18
3
82
Pb
Lead
207.2
2
8
18
32
18
4
83
Bi
Bismuth
208.98
2
8
18
32
18
5
84
Po
Polonium
(209)
2
8
18
32
18
6
85
At
Astatine
(210)
2
8
18
32
18
7
86
Rn
Radon
(222)
2
8
18
32
18
8
87
Fr
Francium
(223)
2
8
18
32
18
8
1
88
Ra
Radium
(226)
2
8
18
32
18
8
2
89
Ac
Actinium
(227)
2
8
18
32
18
9
2
90
Th
Thorium
232.04
2
8
18
32
18
10
2
91
Pa
Protactinium
231.04
2
8
18
32
20
9
2
92
U
Uranium
238.03
2
8
18
32
21
9
2
93
Np
Neptunium
(237)
2
8
18
32
22
9
2
94
Pu
Plutonium
(244)
2
8
18
32
24
8
2
95
Am
Americium
(243)
2
8
18
32
25
8
2
96
Cm
Curium
(247)
2
8
18
32
25
9
2
97
Bk
Berkelium
(247)
2
8
18
32
27
8
2
98
Cf
Californium
(251)
2
8
18
32
28
8
2
99
Es
Einsteinium
(252)
2
8
18
32
29
8
2
100
Fm
Fermium
(257)
2
8
18
32
30
8
2
101
Md
Mendelevium
(258)
2
8
18
32
31
8
2
102
No
Nobelium
(259)
2
8
18
32
32
8
2
103
Lr
Lawrencium
(262)
2
8
18
32
32
8
3
104
Rf
Rutherfordium
(267)
2
8
18
32
32
10
2
105
Db
Dubnium
(270)
2
8
18
32
32
11
2
106
Sg
Seaborgium
(271)
2
8
18
32
32
12
2
107
Bh
Bohrium
(270)
2
8
18
32
32
13
2
108
Hs
Hassium
(277)
2
8
18
32
32
14
2
109
Mt
Meitnerium
(276)
2
8
18
32
32
15
2
110
Ds
Darmstadtium
(281)
2
8
18
32
32
17
1
111
Rg
Roentgenium
(282)
2
8
18
32
32
17
2
112
Cn
Copernicium
(285)
2
8
18
32
32
18
2
113
Uut
Nihonium
(285)
2
8
18
32
32
18
3
114
Fl
Flerovium
(289)
2
8
18
32
32
18
4
115
Uup
Moscovium
(290)
2
8
18
32
32
18
5
116
Lv
Livermorium
(293)
2
8
18
32
32
18
6
117
Uus
Tennessine
(294)
2
8
18
32
32
18
7
118
Uuo
Oganesson
(294)
2
8
18
32
32
18
8
57-71
89-103
Alkali Metals
Alkaline Earth Metals
Lanthanoids
Aktinoids
Transition Metals
Post-Transition Metals
Metalloids
Other Nonmetals
Noble Gasses
Unknown