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Period numbers

The period number is an identifier used to describe the row of the standard periodic table in which the element appears.

The lanthanoids and actinoids are extensions of Periods 6 and 7 respectively, hence their assignment to those Periods.

Units

None

Notes

None

Literature sources

  1. International Union of Pure & Applied Chemistry: Commission on the Nomeclature of Inorganic Chemistry, Nomenclature of Inorganic Chemistry Recommendations 2005, Eds. N.G. Connelly, T. Damhus, R.M. Hartshorn, and A.T. Hutton, Royal Sociery of Chemistry, 2005. ISBN-13: 978-0854044382.
  2. W.C. Fernelius, and W.H. Powell, "Confusion in the periodic table of the elements", J. Chem. Ed., 1982, 59, 504-508.
  3. Periodic table in any volume of the Inorganic Oxford Chemistry Primers, Oxford University Press, Oxford, UK.
Explore the element of your choice through this periodic table.
1 2   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
S
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
*
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
**
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
 
*Lanthanoids *
57
58
59
60
61
62
63
64
65
66
67
68
69
70
**Actinoids **
89
90
91
92
93
94
95
96
97
98
99
100
101
102