Protonové číslo Symbol Český název Latinský název modifikace lat./int. názvu Skupina Perioda 1 H vodík hydrogenium 1 1 2 He helium helium 18 1 3 Li lithium lithium 1 2 4 Be beryllium beryllium 2 2 5 B bor borum 13 2 6 C uhlík carboneum karbonum 4 2 7 N dusík nitrogenium 15 2 8 O kyslík oxygenium 16 2 9 F fluor fluorum 17 2 10 Ne neon neon neonum 18 2 11 Na sodík natrium 1 3 12 Mg hořčík magnesium 2 3 13 Al hliník aluminium 13 3 14 Si křemík silicium 14 3 15 P fosfor phosphorus fosforum 15 3 16 S síra sulphur sulfurum 16 3 17 Cl chlor chlorum 17 3 18 Ar argon argon argonum 18 3 19 K draslík kalium 1 4 20 Ca vápník calcium kalcium 2 4 21 Sc skandium scandium skandium 3 4 22 Ti titan titanium 4 4 23 V vanad vanadium 5 4 24 Cr chrom chromium 6 4 25 Mn mangan manganum 7 4 26 Fe železo ferrum 8 4 27 Co kobalt cobaltum kobaltum 9 4 28 Ni nikl niccolum nikolum 10 4 29 Cu měď cuprum kuprum 11 4 30 Zn zinek zincum zinkum 12 4 31 Ga gallium gallium 13 4 32 Ge germanium germanium 14 4 33 As arsen arsenicum arsenikum 15 4 34 Se selen selenium 16 4 35 Br brom bromum 17 4 36 Kr krypton krypton kryptonum 18 4 37 Rb rubidium rubidium 1 5 38 Sr stroncium strontium stroncium 2 5 39 Y yttrium yttrium 3 5 40 Zr zirkonium zirconium zirkonium 4 5 41 Nb niob niobium 5 5 42 Mo molybden molybdaenum molybdenum 6 5 43 Tc technecium technetium 7 5 44 Ru ruthenium ruthenium 8 5 45 Rh rhodium rhodium 9 5 46 Pd palladium palladium 10 5 47 Ag stříbro argentum 11 5 48 Cd kadmium cadmium kadmium 12 5 49 In indium indium 13 5 50 Sn cín stannum 14 5 51 Sb antimon stibium 15 5 52 Te tellur tellurium 16 5 53 I jod iodum jodum 17 5 54 Xe xenon xenon xenonum 18 5 55 Cs cesium caesium cesium 1 6 56 Ba barium baryum barium 2 6 57 La lanthan lanthanum 3 6 58 Ce cer cerium 6 59 Pr praseodym praseodymium 6 60 Nd neodym neodymium 6 61 Pm promethium promethium 6 62 Sm samarium samarium 6 63 Eu europium europium 6 64 Gd gadolinium gadolinium 6 65 Tb terbium terbium 6 66 Dy dysprosium dysprosium 6 67 Ho holmium holmium 6 68 Er erbium erbium 6 69 Tm thulium thulium 6 70 Yb ytterbium ytterbium 6 71 Lu lutecium lutetium lutecium 3 6 72 Hf hafnium hafnium 4 6 73 Ta tantal tantalum 5 6 74 W wolfram wolframium 6 6 75 Re rhenium rhenium 7 6 76 Os osmium osmium 8 6 77 Ir iridium iridium 9 6 78 Pt platina platinum 10 6 79 Au zlato aurum 11 6 80 Hg rtuť hydrargyrum 12 6 81 Tl thallium thallium 13 6 82 Pb olovo plumbum 14 6 83 Bi bismut bismuthum 15 6 84 Po polonium polonium 16 6 85 At astat astatium 17 6 86 Rn radon radon radonum 18 6 87 Fr francium francium 1 7 88 Ra radium radium 2 7 89 Ac aktinium actinium aktinium 3 7 90 Th thorium thorium 7 91 Pa protaktinium protactinium protaktinium 7 92 U uran uranium 7 93 Np neptunium neptunium 7 94 Pu plutonium plutonium 7 95 Am americium americium 7 96 Cm curium curium 7 97 Bk berkelium berkelium 7 98 Cf kalifornium californium kalifornium 7 99 Es einsteinium einsteinium 7 100 Fm fermium fermium 7 101 Md mendelevium mendelevium 7 102 No nobelium nobelium 7 103 Lr lawrencium lawrencium 3 7 104 Rf rutherfordium rutherfordium 4 7 105 Db dubnium dubnium 5 7 106 Sg seaborgium seaborgium 6 7 107 Bh bohrium bohrium 7 7 108 Hs hassium hassium 8 7 109 Mt meitnerium meitnerium 9 7 110 Ds darmstadtium darmstadtium 10 7 111 Rg roentgenium roentgenium 11 7 112 Cn kopernicium copernicium kopernicium 12 7 113 Nh nihonium nihonium 13 7 114 Fl flerovium flerovium 14 7 115 Mc moskovium moscovium moskovium 15 7 116 Lv livermorium livermorium 16 7 117 Ts tennessin tennessine tennessium 17 7 118 Og oganesson oganesson oganessum 18 7