- Chemistry Notes for UPSC IAS Prelims (Part II)
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- Elements With Their Valence
- Elements With Their Atomic Number
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Elements With Their Atomic Number
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 |
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