Log in

We think you are located in United States. Is this correct?

We use this information to present the correct curriculum and to personalise content to better meet the needs of our users.

Periodic Table of the Elements

Left to right: Atomic number, Symbol, Name, Relative atomic mass, Electronegativity

Atomic number Symbol Name Relative atomic mass Electronegativity 1 H Hydrogen 1,01 2,1 Electronegativity Symbol Name Relative atomic mass Electronegativity
Categories
Alkali metals Alkali earth metals
Transition metals Post-transition metals
Metalloids Other non-metals
Halogens Noble gases
Lanthanides Actinides
Hydrogen Unknown properties
1 (I) 18 (VIII)
1 H Hydrogen 1,01 2,1 2 (II) 13 (III) 14 (IV) 15 (V) 16 (VI) 17 (VII) 2 He Helium 4,00
3 Li Lithium 6,94 1,0 4 Be Beryllium 9,01 1,5 5 B Boron 10,8 2,0 6 C Carbon 12,0 2,5 7 N Nitrogen 14,0 3,0 8 O Oxygen 16,0 3,5 9 F Fluorine 19,0 4,0 10 Ne Neon 20,2
11 Na Sodium 23,0 0,9 12 Mg Magnesium 24,3 1,2 3 4 5 6 7 8 9 10 11 12 13 Al Aluminium 27,0 1,5 14 Si Silicon 28,1 1,8 15 P Phosphorus 31,0 2,1 16 S Sulfur 32,1 2,5 17 Cl Chlorine 35,45 3,0 18 Ar Argon 39,9
19 K Potassium 39,1 0,8 20 Ca Calcium 40,1 1,0 21 Sc Scandium 45,0 1,3 22 Ti Titanium 47,9 1,5 23 V Vanadium 50,9 1,6 24 Cr Chromium 52,0 1,6 25 Mn Manganese 54,9 1,5 26 Fe Iron 55,8 1,8 27 Co Cobalt 58,9 1,8 28 Ni Nickel 58,7 1,8 29 Cu Copper 63,5 1,9 30 Zn Zinc 65,4 1,6 31 Ga Gallium 70,0 1,6 32 Ge Germanium 73,0 1,8 33 As Arsenic 75,0 2,0 34 Se Selenium 79,0 2,4 35 Br Bromine 79,9 2,8 36 Kr Krypton 83,8
37 Rb Rubidium 85,5 0,8 38 Sr Strontium 87,6 1,0 39 Y Yttrium 89,0 1,2 40 Zr Zirconium 91,0 1,4 41 Nb Niobium 92,0 42 Mo Molybdenum 96,0 1,8 43 Tc Technetium (98) 1,9 44 Ru Ruthenium 101,1 2,2 45 Rh Rhodium 102,9 2,2 46 Pd Palladium 106,4 2,2 47 Ag Silver 107,9 1,9 48 Cd Cadmium 112,0 1,7 49 In Indium 115,0 1,7 50 Sn Tin 118,7 1,8 51 Sb Antimony 122,0 1,9 52 Te Tellurium 128,0 2,1 53 I Iodine 126,9 2,5 54 Xe Xenon 131,3
55 Cs Cesium 132,9 0,7 56 Ba Barium 137,3 0,9 57 - 71 57 La Lanthanum 139,0 58 Ce Cerium 140,0 59 Pr Praseodymium 141,0 60 Nd Neodymium 144,0 61 Pm Promethium 62 Sm Samarium 150,0 63 Eu Europium 152,0 64 Gd Gadolinium 157,0 65 Tb Terbium 159,0 66 Dy Dysprosium 163,0 67 Ho Holmium 165,0 68 Er Erbium 167,0 69 Tm Thulium 169,0 70 Yb Ytterbium 173,0 71 Lu Lutetium 175,0 72 Hf Hafnium 179,0 1,6 73 Ta Tantalum 181,0 74 W Tungsten 184,0 75 Re Rhenium 186,2 1,9 76 Os Osmium 190,0 77 Ir Iridium 192,0 78 Pt Platinum 195,1 2,2 79 Au Gold 197,0 1,9 80 Hg Mercury 200,6 2,0 81 Tl Thallium 204,0 1,8 82 Pb Lead 207,2 1,8 83 Bi Bismuth 209,0 1,9 84 Po Polonium 2,0 85 At Astatine 2,5 86 Rn Radon
87 Fr Francium 0,7 88 Ra Radium 226 0,9 89 - 103 89 Ac Actinium 90 Th Thorium 232,0 91 Pa Protactinium 92 U Uranium 238,0 1,4 93 Np Neptunium 94 Pu Plutonium 95 Am Americium 96 Cm Curium 97 Bk Berkelium 98 Cf Californium 99 Es Einsteinium 100 Fm Fermium 101 Md Mendelevium 102 No Nobelium 103 Lr Lawrencium 104 Rf Rutherfordium 105 Db Dubnium 106 Sg Seaborgium 107 Bh Bohrium 108 Hs Hassium 109 Mt Meitnerium 110 Ds Darmstadtium 111 Rg Roentgenium 112 Cn Copernicium 113 Nh Nihonium 114 Fl Flerovium 115 Mc Moscovium 116 Lv Livermorium 117 Ts Tennessine 118 Og Oganesson
57 La Lanthanum 139,0 58 Ce Cerium 140,0 59 Pr Praseodymium 141,0 60 Nd Neodymium 144,0 61 Pm Promethium 62 Sm Samarium 150,0 63 Eu Europium 152,0 64 Gd Gadolinium 157,0 65 Tb Terbium 159,0 66 Dy Dysprosium 163,0 67 Ho Holmium 165,0 68 Er Erbium 167,0 69 Tm Thulium 169,0 70 Yb Ytterbium 173,0 71 Lu Lutetium 175,0
89 Ac Actinium 90 Th Thorium 232,0 91 Pa Protactinium 92 U Uranium 238,0 1,4 93 Np Neptunium 94 Pu Plutonium 95 Am Americium 96 Cm Curium 97 Bk Berkelium 98 Cf Californium 99 Es Einsteinium 100 Fm Fermium 101 Md Mendelevium 102 No Nobelium 103 Lr Lawrencium
The values used are those defined in the South African CAPS document.