<Table> <Tr> <Th colspan="20"> ( hide ) <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> Periodic table </Th> </Tr> <Tr> <Th> Group </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> 5 </Th> <Th> 6 </Th> <Th> 7 </Th> <Th> 8 </Th> <Th> 9 </Th> <Th> 10 </Th> <Th> 11 </Th> <Th> 12 </Th> <Th> 13 </Th> <Th> 14 </Th> <Th> 15 </Th> <Th> 16 </Th> <Th> 17 </Th> <Th> 18 </Th> </Tr> <Tr> <Td> </Td> <Td> Alkali metals </Td> <Td> Alkaline earth metals </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Pnictogens </Td> <Td> Chalcogens </Td> <Td> Halogens </Td> <Td> Noble gases </Td> </Tr> <Tr> <Th> Period <P> </P> </Th> <Td> Hydrogen 1H </Td> <Td colspan="17"> </Td> <Td> Helium 2He </Td> </Tr> <Tr> <Th> </Th> <Td> Lithium 3Li </Td> <Td> Beryllium 4Be </Td> <Td colspan="11"> </Td> <Td> Boron 5B </Td> <Td> Carbon 6C </Td> <Td> Nitrogen 7N </Td> <Td> Oxygen 8O </Td> <Td> Fluorine 9F </Td> <Td> Neon 10 Ne </Td> </Tr> <Tr> <Th> </Th> <Td> Sodium 11 Na </Td> <Td> Magnesium 12 Mg </Td> <Td colspan="11"> </Td> <Td> Aluminium 13 Al </Td> <Td> Silicon 14 Si </Td> <Td> Phosphorus 15 P </Td> <Td> Sulfur 16 S </Td> <Td> Chlorine 17 Cl </Td> <Td> Argon 18 Ar </Td> </Tr> <Tr> <Th> </Th> <Td> Potassium 19 K </Td> <Td> Calcium 20 Ca </Td> <Td> Scandium 21 Sc </Td> <Td> </Td> <Td> Titanium 22 Ti </Td> <Td> Vanadium 23 V </Td> <Td> Chromium 24 Cr </Td> <Td> Manganese 25 Mn </Td> <Td> Iron 26 Fe </Td> <Td> Cobalt 27 Co </Td> <Td> Nickel 28 Ni </Td> <Td> Copper 29 Cu </Td> <Td> Zinc 30 Zn </Td> <Td> Gallium 31 Ga </Td> <Td> Germanium 32 Ge </Td> <Td> Arsenic 33 As </Td> <Td> Selenium 34 Se </Td> <Td> Bromine 35 Br </Td> <Td> Krypton 36 Kr </Td> </Tr> <Tr> <Th> 5 </Th> <Td> Rubidium 37 Rb </Td> <Td> Strontium 38 Sr </Td> <Td> Yttrium 39 Y </Td> <Td> </Td> <Td> Zirconium 40 Zr </Td> <Td> Niobium 41 Nb </Td> <Td> Molybdenum 42 Mo </Td> <Td> Technetium 43 Tc </Td> <Td> Ruthenium 44 Ru </Td> <Td> Rhodium 45 Rh </Td> <Td> Palladium 46 Pd </Td> <Td> Silver 47 Ag </Td> <Td> Cadmium 48 Cd </Td> <Td> Indium 49 In </Td> <Td> Tin 50 Sn </Td> <Td> Antimony 51 Sb </Td> <Td> Tellurium 52 Te </Td> <Td> Iodine 53 I </Td> <Td> Xenon 54 Xe </Td> </Tr> <Tr> <Th> 6 </Th> <Td> Caesium 55 Cs </Td> <Td> Barium 56 Ba </Td> <Td> Lanthanum 57 La </Td> <Td> </Td> <Td> Hafnium 72 Hf </Td> <Td> Tantalum 73 Ta </Td> <Td> Tungsten 74 W </Td> <Td> Rhenium 75 Re </Td> <Td> Osmium 76 Os </Td> <Td> Iridium 77 Ir </Td> <Td> Platinum 78 Pt </Td> <Td> Gold 79 Au </Td> <Td> Mercury 80 Hg </Td> <Td> Thallium 81 Tl </Td> <Td> Lead 82 Pb </Td> <Td> Bismuth 83 Bi </Td> <Td> Polonium 84 Po </Td> <Td> Astatine 85 At </Td> <Td> Radon 86 Rn </Td> </Tr> <Tr> <Th> 7 </Th> <Td> Francium 87 Fr </Td> <Td> Radium 88 Ra </Td> <Td> Actinium 89 Ac </Td> <Td> </Td> <Td> Rutherfordium 104 Rf </Td> <Td> Dubnium 105 Db </Td> <Td> Seaborgium 106 Sg </Td> <Td> Bohrium 107 Bh </Td> <Td> Hassium 108 Hs </Td> <Td> Meitnerium 109 Mt </Td> <Td> Darmstadtium 110 Ds </Td> <Td> Roentgenium 111 Rg </Td> <Td> Copernicium 112 Cn </Td> <Td> Nihonium 113 Nh </Td> <Td> Flerovium 114 Fl </Td> <Td> Moscovium 115 Mc </Td> <Td> Livermorium 116 Lv </Td> <Td> Tennessine 117 Ts </Td> <Td> Oganesson 118 Og </Td> </Tr> <Tr> <Td colspan="20"> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Cerium 58 Ce </Td> <Td> Praseodymium 59 Pr </Td> <Td> Neodymium 60 Nd </Td> <Td> Promethium 61 Pm </Td> <Td> Samarium 62 Sm </Td> <Td> Europium 63 Eu </Td> <Td> Gadolinium 64 Gd </Td> <Td> Terbium 65 Tb </Td> <Td> Dysprosium 66 Dy </Td> <Td> Holmium 67 Ho </Td> <Td> Erbium 68 Er </Td> <Td> Thulium 69 Tm </Td> <Td> Ytterbium 70 Yb </Td> <Td> Lutetium 71 Lu </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Thorium 90 Th </Td> <Td> Protactinium 91 Pa </Td> <Td> Uranium 92 U </Td> <Td> Neptunium 93 Np </Td> <Td> Plutonium 94 Pu </Td> <Td> Americium 95 Am </Td> <Td> Curium 96 Cm </Td> <Td> Berkelium 97 Bk </Td> <Td> Californium 98 Cf </Td> <Td> Einsteinium 99 Es </Td> <Td> Fermium 100 Fm </Td> <Td> Mendelevium 101 Md </Td> <Td> Nobelium 102 No </Td> <Td> Lawrencium 103 Lr </Td> <Td> </Td> </Tr> <Tr> <Td colspan="20"> </Td> </Tr> <Tr> <Td
the first element on the periodic table is
Hydrogen