1
H
Hydrogen
1.00794
1
s
1
2
He Helium
4.00260
1
s
2
3
Li
Lithium
6.941
[He]2
s
1
11
Na Sodium
22.98977
[Ne]3
s
1
19
K
Potassium
39.0983
[Ar]4
s
1
37
Rb
Rubidium
85.4678
[Kr]5
s
1
55
Cs Cesium
132.9054
[Xe]6
s
1
87
Fr
Francium
(223)
[Rn]7
s
1
4
Be
Ber
yllium
9.01218
[He]2
s
2
12
Mg
Magnesium
24.305
[Ne]3
s
2
5
B
Boron
10.81
[He]2
s
2 2
p
1
13
Al
Aluminum
26.98154
[Ne]3
s
2 3
p
1
6
C
Carbon
12.011
[He]2
s
2 2
p
2
14
Si
Silicon
28.0855
[Ne]3
s
2 3
p
2
7
N
Nitrogen
14.0067
[He]2
s
2 2
p
3
15
P
Phosphorus
30.97376
[Ne]3
s
2 3
p
3
8
O
Oxygen
15.9994
[He]2
s
2 2
p
4
16
S
Sulfur
32.066
[Ne]3
s
2 3
p
4
9
F
Fluorine
18.998403
[He]2
s
2 2
p
5
17
Cl
Chlorine
35.453
[Ne]3
s
2 3
p
5
10
Ne Neon
20.1797
[He]2
s
2 2
p
6
18
Ar Argon
39.948
[Ne]3
s
2 3
p
6
20
Ca
Calcium
40.078
[Ar]4
s
2
38
Sr
Strontium
87.62
[Kr]5
s
2
56
Ba Barium 137.33
[Xe]6
s
2
88
Ra
Radium
226.0254
[Rn]7
s
2
57
La
Lanthanum
138.9055
[Xe]
5d
1 6
s
2
89
Ac
Actinium
227.0278
[Rn]
6d
1 7
s
2
58
Ce Cerium
140.12
[Xe]
4f
1 5
d
1 6
s
2
90
Th
Thorium
232.0381
[Rn]
6d
2 7
s
2
59
Pr
Praseodymium
140.9077
[Xe]
4f
3 6
s
2
91
Pa
Protactinium
231.0359
[Rn]
5f
2 6
d
1 7
s
2
60
Nd
Neodymium
144.24
[Xe]
4f
4 6
s
2
92
U
Uranium
238.0289
[Rn]
5f
3 6
d
1 7
s
2
61
Pm
Promethium
(145)
[Xe]
4f
5 6
s
2
93
Np
Neptunium
237.048
[Rn]
5f
4 6
d
1 7
s
2
62
Sm
Samarium
150.36
[Xe]
4f
6 6
s
2
94
Pu
Plutonium
(244)
[Rn]
5f
6 7
s
2
63
Eu
Europium
151.96
[Xe]
4f
7 6
s
2
95
Am
Americium
(243)
[Rn]
5f
7 7
s
2
64
Gd
Gadolinium
157.25
[Xe]
4f
7 5
d
1 6
s
2
96
Cm Curium
(247)
[Rn]
5f
7 6
d
1 7
s
2
65
Tb
Terbium
158.9254
[Xe]
4f
9 6
s
2
97
Bk
Berkelium
(247)
[Rn]
5f
9 7
s
2
66
Dy
Dysprosium
162.50
[Xe]
4f
10
6
s
2
98
Cf
Californium
(251)
[Rn]
5f
10
7
s
2
67
Ho
Holmium
164.9304
[Xe]
4f
11
6
s
2
99
Es
Einsteinium
(252)
[Rn]
5f
11
7
s
2
69
Tm Thulium
168.9342
[Xe]
4f
13
6
s
2
101
Md
Mendelevium
(258)
[Rn]
5f
13
7
s
2
68
Er
Erbium
167.26
[Xe]
4f
12
6
s
2
100
Fm
Fermium
(257)
[Rn]
5f
12
7s
2
70
Yb
Ytterbium
173.04
[Xe]
4f
14
6
s
2
102
No
Nobelium
(259)
[Rn]
5f
14
7
s
2
21
Sc
Scandium
44.9559
[Ar]
3d
1 4
s
2
39
Y
Yttrium
88.9059
[Kr]
4d
1 5
s
2
71
Lu
Lutetium
174.967
[Xe]
4f
14
5d
1 6
s
2
103
Lr
Lawrencium
(262)
[Rn]
5f
14
6d
1 7
s
2
22
Ti
T
itanium
47.88
[Ar]
3d
2 4
s
2
40
Zr
Zirconium
91.224
[Kr]
4d
2 5
s
2
72
Hf
Hafnium
178.49
[Xe]
4f
14
5d
2 6
s
2
104
Rf
Rutherfordium
(261)
[Rn]
5f
14
6d
2 7
s
2
23
V
V
anadium
50.9415
[Ar]
3d
3 4
s
2
41
Nb
Niobium
92.9064
[Kr]
4d
4 5
s
1
73
Ta
Tantalum
180.9479
[Xe]
4f
14
5d
3 6
s
2
105
Db
Dubnium
(262)
[Rn]
5f
14
6d
3 7
s
2
24
Cr
Chromium
51.996
[Ar]
3d
5 4
s
1
42
Mo
Molybdenum
95.94
[Kr]
4d
5 5
s
1
74
W
Tungsten
183.85
[Xe]
4f
14
5d
4 6
s
2
106
Sg
Seaborgium
(263)
[Rn]
5f
14
6d
4 7
s
2
25
Mn
Manganese
54.9380
[Ar]
3d
5 4
s
2
43
Tc
Technetium
(98)
[Kr]
4d
5 5
s
2
75
Re
Rhenium
186.207
[Xe]
4f
14
5d
5 6
s
2
107
Bh
Bohrium
(262)
[Rn]
5f
14
6d
5 7
s
2
26
Fe Iron
55.847
[Ar]
3d
6 4
s
2
44
Ru
Ruthenium
101.07
[Kr]
4d
7 5
s
1
76
Os
Osmium
190.2
[Xe]
4f
14
5d
6 6
s
2
108
Hs
Hassium
(265)
[Rn]
5f
14
6d
6 7
s
2
27
Co Cobalt
58.9332
[Ar]
3d
7 4
s
2
45
Rh
Rhodium
102.9055
[Kr]
4d
8 5
s
1
77
Ir
Iridium
192.22
[Xe]
4f
14
5d
7 6
s
2
109
Mt
Meitnerium
(266)
[Rn]
5f
14
6d
7 7
s
2
28
Ni
Nickel
58.69
[Ar]
3d
8 4
s
2
46
Pd
Palladium
106.42
[Kr]
4d
10
78
Pt
Platinum
195.08
[Xe]
4f
14
5d
9 6
s
1
110
Uun
Ununnilium
(269)
[Rn]
5f
14
6d
8 7
s
2
29
Cu Copper
63.546
[Ar]
3d
10
4
s
1
47
Ag Silver
107.8682
[Kr]
4d
10
5
s
1
79
Au Gold
196.9665
[Xe]
4f
14
5d
10
6
s
1
111
Uuu
Unununium
(272)
[Rn]
5f
14
6d
9 7
s
2
30
Zn Zinc
65.39
[Ar]
3d
10
4
s
2
48
Cd
Cadmium
112.41
[Kr]
4d
10
5
s
2
80
Hg
Mercur
y
200.59
[Xe]
4f
14
5d
10
6
s
2
31
Ga Gallium
69.72
[Ar]
3d
10
4
s
2 4
p
1
49
In
Indium
114.82
[Kr]
4d
10
5
s
2 5
p
1
81
Tl
Thallium
204.383
[Xe]
4f
14
5d
10
6s
2 6
p
1
32
Ge
Germanium
72.61
[Ar]
3d
10
4
s
2 4
p
2
50
Sn Ti
n
118.710
[Kr]
4d
10
5
s
2 5
p
2
82
Pb Lead
207.2
[Xe]
4f
14
5d
10
6s
2 6
p
2
33
As Arsenic
74.9216
[Ar]
3d
10
4
s
2 4
p
3
51
Sb
Antimony
121.757
[Kr]
4d
10
5
s
2 5
p
3
83
Bi
Bismuth
208.9804
[Xe]
4f
14
5d
10
6s
2 6
p
3
34
Se
Selenium
78.96
[Ar]
3d
10
4
s
2 4
p
4
52
Te
Tellurium
127.60
[Kr]
4d
10
5
s
2 5
p
4
84
Po
Polonium
(209)
[Xe]
4f
14
5d
10
6s
2 6
p
4
35
Br
Bromine
79.904
[Ar]
3d
10
4
s
2 4
p
5
53
I
Iodine
126.9045
[Kr]
4d
10
5
s
2 5
p
5
85
At
Astatine
(210)
[Xe]
4f
14
5d
10
6s
2 6
p
5
36
Kr
Kr
ypton
83.80
[Ar]
3d
10
4
s
2 4
p
6
54
Xe Xenon
131.29
[Kr]
4d
10
5
s
2 5
p
6
86
Rn Radon
(222)
[Xe]
4f
14
5d
10
6s
2 6
p
6
112
Uub Ununbium
(277)
[Rn]
5f
14
6d
10
7
s
2
2
3
4
5
6
7
1
2
1
3456789
10
11
12
14
15
16
17
18
18
13
1
H
Hydrogen
1.00794
1
s
1
Common
oxidation
states
Atomic
number
Element
symbol
Element
name
Atomic
mass
(or
mass
number
of
longest-lived
isotope)
Electron
configuration
Pe
riod
1
+1
–1
+1
–1
+1
+2
+1
+2
+1
+2
+1
+2
+1
+2
+1
+2
+3
+3
+3
+3
+3
+3
+3
+3
+4
+3
+3
+3
+3
+3
+3
+2
+3
+2
+3
+2
+3
+4
+5
+3
+4
+5
+6
+3
+4
+5
+6
+3
+4
+5
+6
+3
+4
+5
+6
+3
+3
+4
+4
+3
+3
+4
+3
+5
+3
+6
+4
+6
+7
+4
+6
+7
+6
+5
+4
+2
+3
+4
+2
+3
+4
+5
+2
+3
+6
+2
+3
+4
+7
+2
+3
+3
+3
+4
+2
+3
+3
+3
+4
+2
+3
+2
+4
+2
+4
+1
+2
+1
+1
+3
+2
+2
+1
+2
+3
–4
+2
+4
–4
+2
+4
–3
+3
+5
–3
+3
+5
–3
+3
+5
+3
+5
–4
+2
+4
+2
+4
+2
+4
–3 –2 –1 +1 +2 +3 +4
+5
–2
–2
+4
+6
–2
+4
+6
–2
+4
+6
+2
+4
–1
–1
+1
+5
–1
+1
+5
+7
–1
+1
+3
+5
+7
0
0
0
0
0
+2
0
+2
+4
+6
+3
+3
+3
+1
+3
KEY
s
-b
loc
k
p
-b
loc
k
p
-b
loc
k
d
-b
loc
k
GR
OUP
GR
OUP
GR
OUP
f-b
loc
k
T
ransition
Elements
s
-b
loc
k
Note:
Atomic
masses
are
based
on
carbon-12
=
12.000...u
Periodic
T
able
of
the
Elements
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