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The periodic table is the most important reference a chemist has because it puts all the known elements into a meaningful pattern. Elements are arranged left to right and top to bottom in order of increasing atomic number. This order generally goes with increasing atomic mass.
Click on an element for more information(you will be leaving this site and going to the Los Alamos National Laboratory site):
| Period | ||||||||||||||||||
| 1 IA 1A |
18 VIIIA 8A |
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| 1 | 1 H 1.008 |
2 IIA 2A |
13 IIIA 3A |
14 IVA 4A |
15 VA 5A |
16 VIA 6A |
17 VIIA 7A |
2 He 4.003 |
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| 2 | 3 Li 6.941 |
4 Be 9.012 |
5 B 10.81 |
6 C 12.01 |
7 N 14.01 |
8 O 16.00 |
9 F 19.00 |
10 Ne 20.18 |
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| 3 | 11 Na 22.99 |
12 Mg 24.31 |
3 IIIB 3B |
4 IVB 4B |
5 VB 5B |
6 VIB 6B |
7 |
8 | 9 | 10 | 11 IB 1B |
12 IIB 2B |
13 Al 26.98 |
14 Si 28.09 |
15 P 30.97 |
16 S 32.07 |
17 Cl 35.45 |
18 Ar 39.95 |
| -------
VIII ------- ------- 8 ------- |
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| 4 | 19 K 39.10 |
20 Ca 40.08 |
21 Sc 44.96 |
22 Ti 47.88 |
23 V 50.94 |
24 |
25 |
26 Fe 55.85 |
27 Co 58.47 |
28 Ni 58.69 |
29 |
30 Zn 65.39 |
31 Ga 69.72 |
32 Ge 72.59 |
33 As 74.92 |
34 Se 78.96 |
35 Br 79.90 |
36 Kr 83.80 |
| 5 | 37 Rb 85.47 |
38 Sr 87.62 |
39 Y 88.91 |
40 Zr 91.22 |
41 Nb 92.91 |
42 Mo 95.94 |
43 Tc (98) |
44 Ru 101.1 |
45 Rh 102.9 |
46 Pd 106.4 |
47 Ag 107.9 |
48 Cd 112.4 |
49 In 114.8 |
50 Sn 118.7 |
51 Sb 121.8 |
52 Te 127.6 |
53 I 126.9 |
54 Xe 131.3 |
| 6 | 55 Cs 132.9 |
56 Ba 137.3 |
57 La* 138.9 |
72 Hf 178.5 |
73 Ta 180.9 |
74 W 183.9 |
75 Re 186.2 |
76 Os 190.2 |
77 Ir 190.2 |
78 Pt 195.1 |
79 Au 197.0 |
80 Hg 200.5 |
81 Tl 204.4 |
82 Pb 207.2 |
83 Bi 209.0 |
84 Po (210) |
85 At (210) |
86 Rn (222) |
| 7 | 87 Fr (223) |
88 Ra (226) |
89 Ac~ (227) |
104 Rf (257) |
105 Db (260) |
106 Sg (263) |
107 Bh (262) |
108 Hs (265) |
109 Mt (266) |
110 Uun () |
111 Uuu () |
112 Uub () |
114 Uuq () |
116 --- () |
118 --- () |
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| Lanthanide Series | 58 Ce 140.1 |
59 Pr 140.9 |
60 Nd 144.2 |
61 Pm (147) |
62 Sm 150.4 |
63 Eu 152.0 |
64 Gd 157.3 |
65 Tb 158.9 |
66 Dy 162.5 |
67 Ho 164.9 |
68 Er 167.3 |
69 Tm 168.9 |
70 Yb 173.0 |
71 Lu 175.0 |
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| Actinide Series | 90 Th 232.0 |
91 Pa (231) |
92 U (238) |
93 Np (237) |
94 Pu (242) |
95 Am (243) |
96 Cm (247) |
97 Bk (247) |
98 Cf (249) |
99 Es (254) |
100 Fm (253) |
101 Md (256) |
102 No (254) |
103 Lr (257) |
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The different rows of elements are called periods. The period number of an element signifies the highest energy level an electron in that element occupies (in the unexcited state). The number of elements in a period increases as one moves down the periodic table because as the energy level of the atom increases, the number of energy sub-levels per energy level increases.
In 1869, the Russian chemist Mendeleev noted that the repeating patterns of behavior could be arranged in a sequence of elements. This led to the first "Periodic Table" of the elements.
Scientists and students who are familiar with the periodic table use the position in the table to extract information about individual elements.
For a list of the element names and symbols in alphabetical order.
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