This is the online scientific reference and dictionary of the elements. The elements are arranged in the standard periodic table format as shown below. Click on the elements to reveal their properties, uses and history.

1A 2A 3B 4B 5B 6B 7B 8 8 8 1B 2B 3A 4A 5A 6A 7A O 1 1 H 2 He 2 3 Li 4 Be 5 B 6 C 7 N 8 O 9 F 10 Ne 3 11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar 4 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 5 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 6 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 7 87 Fr 88 Ra * 104 Rf 105 Db 106 Sg 107 Bh 108 Hs 109 Mt 110 Ds + Lanthanide: 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 * Actinide: 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

Note: The version of the periodic table is based on the recommendation of the Commission on the Nomenclature of Inorganic Chemistry1. The atomic weights were taken from the agreement published2 in 2001. While there are many isotopes had been detected in experiment, only the natural occurring isotopes for a given element are listed.

References: G.J. Leigh (ed.), Nomenclature of Inorganic Chemistry, Recommendation 1990, Blackwell Scientific Publications (1990) Pure & Appl. Chem., 73, 667 (2001); Chem. Internat., 23, 179 (2001)

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