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The periodic table of the elements

The periodic table is an arrangment of the chemical elements ordered by atomic number so that periodic properties of the elements (chemical periodicity) are made clear.

Explore the chemical elements through this periodic table.
Group 1 2   3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period
1
1
1.008
2
4.0026
2
3
6.94
4
9.0122
5
10.81
6
12.011
7
14.007
8
15.999
9
18.998
10
20.180
3
11
22.990
12
24.305
13
26.982
14
28.085
15
30.974
16
S
32.06
17
35.45
18
39.948
4
19
39.098
20
40.078
21
44.956
22
47.867
23
50.942
24
51.996
25
54.938
26
55.845
27
58.933
28
58.693
29
63.546
30
65.38
31
69.723
32
72.630
33
74.922
34
78.971
35
79.904
36
83.798
5
37
85.468
38
87.62
39
88.906
40
91.224
41
92.906
42
95.95
43
[98.906]
44
101.07
45
102.91
46
106.42
47
107.87
48
112.41
49
114.82
50
118.71
51
121.76
52
127.60
53
126.90
54
131.29
6
55
132.91
56
137.33
*
71
174.97
72
178.49
73
180.95
74
183.84
75
186.21
76
190.23
77
192.22
78
195.08
79
196.97
80
200.59
81
204.38
82
207.2
83
208.98
84
[208.98]
85
[209.99]
86
[222.02]
7
87
[223.02]
88
[226.03]
**
103
[262.11]
104
[267.12]
105
[270.13]
106
[269.13]
107
[270.13]
108
[269.13]
109
[278.16]
110
[281.17]
111
[281.17]
112
[285.18]
113
[286.18]
114
[289.19]
115
[289.19]
116
[293.20]
117
[293.21]
118
[294.21]
 
*Lanthanoids *
57
138.91
58
140.12
59
140.91
60
144.24
61
[144.91]
62
150.36
63
151.96
64
157.25
65
158.93
66
162.50
67
164.93
68
167.26
69
168.93
70
173.05
**Actinoids **
89
[227.03]
90
232.04
91
231.04
92
238.03
93
[237.05]
94
[244.06]
95
[243.06]
96
[247.07]
97
[247.07]
98
[251.08]
99
[252.08]
100
[257.10]
101
[258.10]
102
[259.10]

The standard form of the periodic table shown here includes periods (shown horizontally) and groups (shown vertically). The properties of elements in groups are similar in some respects to each other.

There is no one single or best structure for the periodic table but by whatever consensus there is, the form used here is very useful and the most common. The periodic table is a masterpiece of organised chemical information and the evolution of chemistry's periodic table into the current form is an astonishing achievement.