Period
Periodic Table of the Elements 1
18 +1 –1
1.00794
H
1 1
4.00260
KEY
12.011
Atomic Mass
1
C
Symbol
Group 2
1
+1 9.01218
6.941
Li
2 3
2-1
Be
Group
+1 24.305
K
4 19
2-8-8-1 85.4678
Rb
37
2-8-18-8-1 132.905
2-8-18-18-8-1 (223)
7 87
Fr
-18-32-18-8-1
B
Group
+1 40.08
+2 44.9559
Ca Sc
20
2-8-8-2 +1 87.62
38
Sr
2-8-18-8-2 +1 137.33
56
2-8-18-18-8-2 +1 226.025
21
2-8-9-2 +2 88.9059
39
Y
2-8-18-9-2 +2 138.906
57
2-8-18-18-9-2 +2 227.028
Ra Ac
88
-18-32-18-8-2
4
89
-18-32-18-9-2
+3 47.88
Ti
22
2-8-10-2 +3 91.224
40
Zr
2-8-18-10-2 +3 178.49
72
Hf
**18-32-10-2 +3 (261)
5 +2 51.996 +3 +4 +5
+2 50.9415 +3 +4
V
23
7
6
24
2-8-11-2
+3 95.94 +5
26
25
2-8-13-2 +3 (98) +6
Nb Mo Tc
41
2-8-18-12-1 +4 180.948
42
2-8-18-13-1 +5 183.85
Ta
73
74
+2 55.847 +3 +4 +7
Cr Mn Fe
2-8-13-1
+4 92.9064
+2 54.9380 +3 +6
W
43
2-8-18-14-1 +6 186.207
2-8-14-2 +4 101.07 +6 +7
+2 58.9332 +3
Co
27
2-8-15-2 +3 102.906
10 +2 58.69 +3
28
Ni
2-8-16-2
11 +2 63.546 +3
+1 65.39 +2
+2 107.868 +4
2-8-18-15-1 +4 190.2 +6 +7
76
46
45
2-8-18-16-1 +3 192.22 +4
77
Ir
47
2-8-18-18
2-8-18-18-1
+3 195.08 +4
78
Pt
Al
+1 112.41
31
2-8-18-3 +2 114.82
+2 196.967 +4
+1 200.59 +3
Au Hg
79
49
+1 204.383 +2
80
-18-32-15-2
-18-32-17-1
-18-32-18-1
-18-32-18-2
(262)
(263)
(264)
(265)
(268)
(269)
(272)
(277)
In
2-8-18-18-3
2-8-18-18-2
-18-32-14-2
108
109
Si
+3 72.59
48
-18-32-13-2
107
14
+2 69.72
2-8-18-2
-18-32-12-2
106
+3 28.0855
2-8-4
30
-18-32-11-2
105
N
7
2-5
2-8-3
81
Tl
-18-32-18-3
–4 30.97376 +2 +4
P
15
2-8-5 –4 74.9216 +2 +4
111
32
33
2-8-18-4 +3 118.71
2-8-18-5 +2 121.75 +4
Sn Sb 51
50
2-8-18-18-5
2-8-18-18-4 +1 207.2 +3
Pb
+2 208.980 +4
82
83
-18-32-18-4
Bi
-18-32-18-5
17
18
–3 15.9994 –2 –1 +1 +2 +3 +4 +5 2-6
–2 18.998403
2-7
2-8
–3 32.06 +3 +5
–2 35.453 +4 +6
–1 39.948 +1 +3 +5 +7
O
8
16
S
F
9
Cl
17
–1 20.179
Ne
10
18
2-8-6
2-8-7
2-8-8
–2 79.904 +4 +6
–1 83.80 +1 +5
2-8-18-6 –3 127.60 +3 +5
52
Te
2-8-18-18-6 +3 (209) +5
Po
84
-18-32-18-6
35
Br
2-8-18-7 –2 126.905 +4 +6
l
53
2-8-18-18-7 +2 (210) +4
85
36
0
Ar
–3 78.96 +3 +5
34
0
Kr
0 +2
2-8-18-8 –1 131.29 +1 +5 +7
Xe
0 +2 +4 +6
54
2-8-18-18-8 (222)
0
At Rn
-18-32-18-7
86
-18-32-18-8
(285)
Rf Db Sg Bh Hs Mt Uun Uuu Uub
104
–4 14.0067 +2 +4
Cu Zn Ga Ge As Se
29
2-8-18-1
+3 106.42
12
Ru Rh Pd Ag Cd
44
Re Os
75
9
8
13
C
6
16
15
2-4
26.98154
Cs Ba La
55
+3 12.0111
10.81
+2
3
14
13
Note: Mass numbers in parentheses are mass numbers of the most stable or common isotope.
2-4
He
2
Relative atomic masses are based on 12C = 12.000
2-3
2-8-2
39.0983
Uuq
114
112
*The systematic names and symbols for elements of atomic numbers above 109 will be used until the approval of trivial names by IUPAC.
**Denotes the presence of (2-8-) for elements 72 and above 140.12
Ce
58
232.038
+3 140.908 +4
59
+4 231.036
91
+3 144.24
+3 (145)
+3 150.36
+2 151.96 +3
+2 157.25 +3
+3 158.925
+3 162.50
+3 164.930
Pr Nd Pm Sm Eu Gd Tb Dy Ho
Th Pa
90
8
2
5
12
2-8-1
6
Electron Configuration
Na Mg
11
5
+2
Selected Oxidation States
2-2
22.98977
3
4
6
Atomic Number
–4 +2 +4
0
60
61
+4 238.029 +5
+3 237.048 +4 +5 +6
92
93
U
62
+3 (244) +4 +5 +6
63
+3 (243) +4 +5 +6
64
+3 (247) +4 +5 +6
65
+3 (247)
Np Pu Am Cm Bk 94
Reference Tables for Physical Setting/ CHEMISTRY
95
96
97
66
67
+3 (251) +4
98
Cf
+3 (252)
99
+3 167.26
68
+3 168.934
+3 173.04
+3
Er Tm Yb Lu
(257)
69
70
71
(258)
(259)
(260)
Es Fm Md No
Reference Tables for Physical Setting/ CHEMISTRY
+2 174.967 +3
100
101
102
Lr
103
9