Matter, arranged
Periodic Table One hundred and eighteen elements, from hydrogen to oganesson.
The table follows the IUPAC layout: lutetium and lawrencium occupy group 3, while lanthanides and actinides are shown in separate rows. Atomic weights are abridged standard values; bracketed values are mass numbers for elements without stable isotopes.
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1 H 1.008 2 He 4.0026 3 Li 6.94 4 Be 9.0122 5 B 10.81 6 C 12.011 7 N 14.007 8 O 15.999 9 F 18.998 10 Ne 20.180 11 Na 22.990 12 Mg 24.305 13 Al 26.982 14 Si 28.085 15 P 30.974 16 S 32.06 17 Cl 35.45 18 Ar 39.95 19 K 39.098 20 Ca 40.078 21 Sc 44.956 22 Ti 47.867 23 V 50.942 24 Cr 51.996 25 Mn 54.938 26 Fe 55.845 27 Co 58.933 28 Ni 58.693 29 Cu 63.546 30 Zn 65.38 31 Ga 69.723 32 Ge 72.630 33 As 74.922 34 Se 78.971 35 Br 79.904 36 Kr 83.798 37 Rb 85.468 38 Sr 87.62 39 Y 88.906 40 Zr 91.224 41 Nb 92.906 42 Mo 95.95 43 Tc [98] 44 Ru 101.07 45 Rh 102.91 46 Pd 106.42 47 Ag 107.87 48 Cd 112.41 49 In 114.82 50 Sn 118.71 51 Sb 121.76 52 Te 127.60 53 I 126.90 54 Xe 131.29 55 Cs 132.91 56 Ba 137.33 71 Lu 174.97 72 Hf 178.49 73 Ta 180.95 74 W 183.84 75 Re 186.21 76 Os 190.23 77 Ir 192.22 78 Pt 195.08 79 Au 196.97 80 Hg 200.59 81 Tl 204.38 82 Pb 207.2 83 Bi 208.98 84 Po [209] 85 At [210] 86 Rn [222] 87 Fr [223] 88 Ra [226] 103 Lr [266] 104 Rf [267] 105 Db [268] 106 Sg [269] 107 Bh [270] 108 Hs [269] 109 Mt [278] 110 Ds [281] 111 Rg [282] 112 Cn [285] 113 Nh [286] 114 Fl [289] 115 Mc [290] 116 Lv [293] 117 Ts [294] 118 Og [294]
Lanthanides 57 La 138.91 58 Ce 140.12 59 Pr 140.91 60 Nd 144.24 61 Pm [145] 62 Sm 150.36 63 Eu 151.96 64 Gd 157.25 65 Tb 158.93 66 Dy 162.50 67 Ho 164.93 68 Er 167.26 69 Tm 168.93 70 Yb 173.05
Actinides 89 Ac [227] 90 Th 232.04 91 Pa 231.04 92 U 238.03 93 Np [237] 94 Pu [244] 95 Am [243] 96 Cm [247] 97 Bk [247] 98 Cf [251] 99 Es [252] 100 Fm [257] 101 Md [258] 102 No [259]
Hydrogen (H) Atomic number 1 · Reactive nonmetal
Atomic mass 1.008
Group / period 1 / 1
Block s
Phase at 0 °C, 1 atm gas
Ground-state configuration 1s1
Pauling electronegativity 2.2
Discovered 1766
Fact Hydrogen (H) has atomic number 1.