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