The Periodic Table
| 1 IA |
18 VIIIA |
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| 1 H |
2 IIA |
13 IIIA |
14 IVA |
15 VA |
16 VIA |
17 VIIA |
2 He |
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| 3 Li |
4 Be |
5 B |
6 C |
7 N |
8 O |
9 F |
10 Ne |
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| 11 Na |
12 Mg |
3 IIIB |
4 IVB |
5 VB |
6 VIB |
7 VIIB |
8 VIII |
9 VIII |
10 VIII |
11 IB |
12 IIB |
13 Al |
14 Si |
15 P |
16 S |
17 Cl |
18 Ar |
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| 19 K |
20 Ca |
21 Sc |
22 Ti |
23 V |
24 Cr |
25 Mn |
26 Fe |
27 Co |
28 Ni |
29 Cu |
30 Zn |
31 Ga |
32 Ge |
33 As |
34 Se |
35 Br |
36 Kr |
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| 37 Rb |
38 Sr |
39 Y |
40 Zr |
41 Nb |
42 Mo |
43 Tc |
44 Ru |
45 Rh |
46 Pd |
47 Ag |
48 Cd |
49 In |
50 Sn |
51 Sb |
52 Te |
53 I |
54 Xe |
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| 55 Cs |
56 Ba |
* |
72 Hf |
73 Ta |
74 W |
75 Re |
76 Os |
77 Ir |
78 Pt |
79 Au |
80 Hg |
81 Tl |
82 Pb |
83 Bi |
84 Po |
85 At |
86 Rn |
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| 87 Fr |
88 Ra |
** |
104 Rf |
105 Db |
106 Sg |
107 Bh |
108 Hs |
109 Mt |
110 Ds |
111 Rg |
112 Uub |
113 Uut |
114 Uuq |
115 Uup |
116 Uuh |
117 Uus |
118 Uuo |
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| Lanthanides | 57 La |
58 Ce |
59 Pr |
60 Nd |
61 Pm |
62 Sm |
63 Eu |
64 Gd |
65 Tb |
66 Dy |
67 Ho |
68 Er |
69 Tm |
70 Yb |
71 Lu |
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| Actinides | 89 Ac |
90 Th |
91 Pa |
92 U |
93 Np |
94 Pu |
95 Am |
96 Cm |
97 Bk |
98 Cf |
99 Es |
100 Fm |
101 Md |
102 No |
103 Lr |
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The Periodic Table
The arrangement of the periodic table demonstrates recurring 'periodic' chemical properties. Elements are listed in order of increasing atomic number (the number of protons in the atomic nucleus). Rows are arranged so elements with similar properties fall into the same vertical columns, or groups. According to quantum mechanical theories of electron configuration within atoms, each horizontal row, or period, in the table corresponded to the filling of a quantum shell of electrons. There are progressively longer periods farther down the table, grouping the elements into s-, p-, d- and f-blocks to reflect their electron configuration.
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