Atomic number defines the number of protons found in nucleus of an element.
The total number of protons and neutrons (found in nucleus) is calculated as the atomic mass number.
The following table illustrates the some of the significant elements with their atomic number, atomic mass, and symbols −
Element | Atomic Number | Atomic Mass (g mol-1) | Symbol |
---|---|---|---|
Hydrogen | 1 | 1.0079 | H |
Helium | 2 | 4.00 | He |
Lithium | 3 | 6.94 | Li |
Beryllium | 4 | 9.01 | Be |
Boron | 5 | 10.81 | B |
Carbon | 6 | 12.01 | C |
Nitrogen | 7 | 14.0067 | N |
Oxygen | 8 | 16.00 | O |
Fluorine | 9 | 19.00 | F |
Neon | 10 | 20.1797 | Ne |
Sodium | 11 | 22.989768 | Na |
Magnesium | 12 | 24.3050 | Mg |
Aluminum | 13 | 26.981539 | Al |
Silicon | 14 | 28.0855 | Si |
Phosphorus | 15 | 30.973762 | P |
Sulfur | 16 | 32.066 | S |
Chlorine | 17 | 35.4527 | Cl |
Argon | 18 | 39.948 | Ar |
Potassium | 19 | 39.0983 | K |
Calcium | 20 | 40.078 | Ca |
Scandlum | 21 | 44.955910 | Sc |
Titanium | 22 | 47.867 | Ti |
Vanadium | 23 | 50.9415 | V |
Chromium | 24 | 51.9961 | Cr |
Manganese | 25 | 54.93805 | Mn |
Iron | 26 | 55.845 | Fe |
Cobalt | 27 | 58.93320 | Co |
Nickel | 28 | 58.6934 | Ni |
Copper | 29 | 63.546 | Cu |
Zinc | 30 | 65.39 | Zn |
Gallium | 31 | 69.723 | Ga |
Germanium | 32 | 72.61 | Ge |
Arsenic | 33 | 74.92159 | As |
Selenium | 34 | 78.96 | Se |
Bromine | 35 | 79.904 | Br |
Krypton | 36 | 83.80 | Kr |
Rubidium | 37 | 85.4678 | Rb |
Strontium | 38 | 87.62 | Sr |
Yttrium | 39 | 88.90585 | Y |
Zirconium | 40 | 91.224 | Zr |
Niobium | 41 | 92.90638 | Nb |
Molybdenum | 42 | 95.94 | Mo |
Technetium | 43 | 97.9072 | Te |
Ruthenium | 44 | 101.07 | Ru |
Rhodium | 45 | 102.90550 | Rh |
Palladium | 46 | 106.42 | Pd |
Silver | 47 | 107.8682 | Ag |
Cadmium | 48 | 112.411 | Cd |
Indium | 49 | 114.818 | In |
Tin | 50 | 118.710 | Sn |
Antimony | 51 | 121.760 | Sb |
Tellurium | 52 | 127.60 | Te |
Iodine | 53 | 126.90447 | I |
Xenon | 54 | 131.29 | Xe |
Cesium | 55 | 132.90543 | Cs |
Barium | 56 | 137.327 | Ba |
Lanthanum | 57 | 138.9055 | La |
Cerium | 58 | 140.115 | Ce |
Praseodymium | 59 | 140.90765 | Pr |
Neodymium | 60 | 144.24 | Nd |
Promethium | 61 | 144.9127 | Pm |
Samarium | 62 | 150.36 | Sm |
Europium | 63 | 151.965 | Eu |
Gadolinium | 64 | 157.25 | Gd |
Terbium | 65 | 158.92534 | Tb |
Dysprosium | 66 | 162.50 | Dy |
Holmium | 67 | 164.93032 | Ho |
Erbium | 68 | 167.26 | Er |
Thulium | 69 | 168.93421 | Tm |
Ytterbium | 70 | 173.04 | Yb |
Lutetium | 71 | 174.967 | Lu |
Hafnium | 72 | 178.49 | Hf |
Tantalum | 73 | 180.9479 | Ta |
Tungsten | 74 | 183.84 | W |
Rhenium | 75 | 186.207 | Re |
Osmium | 76 | 190.23 | Os |
Iridium | 77 | 192.217 | Ir |
Platinum | 78 | 195.08 | Pt |
Gold | 79 | 196.96654 | Au |
Mercury | 80 | 200.59 | Hg |
Thallium | 81 | 204.3833 | Tl |
Lead | 82 | 207.2 | Pb |
Bismuth | 83 | 208.98037 | Bi |
Polonium | 84 | 208.9824 | Po |
Astatine | 85 | 209.9871 | At |
Radon | 86 | 222.0176 | Rn |
Francium | 87 | 223.0197 | Fr |
Radium | 88 | 226.0254 | Ra |
Actinium | 89 | 227.0278 | Ac |
Thorium | 90 | 232.0381 | Th |
Protactinium | 91 | 231.0388 | Pa |
Uranium | 92 | 238.0289 | U |
Neptunium | 93 | 237.0482 | Np |
Plutonium | 94 | 244.0642 | Pu |
Americium | 95 | 243.0614 | Am |
Curium | 96 | 247.0703 | Cm |
Berkelium | 97 | 247.0703 | Bk |
Californium | 98 | 251.0796 | Cf |
Einsteinium | 99 | 252.083 | Es |
Fermium | 100 | 257.0951 | Fm |
Mendelevium | 101 | 258.10 | Md |
Nobelium | 102 | 259.1009 | No |
Lawrencium | 103 | 262.11 | Lr |
Unnilquadium | 104 | 261.11 | Unq |
Unnilpentium | 105 | 262.114 | Unp |
Unnilhexium | 106 | 263.118* | Unh |
Unnilseptium | 107 | 262.12 | Uns |