Electrons are arrange around the nucleus of an atom on energy levels (or shells). The maximum number of electrons on an energy level is given by the following formula: 2n2 (n=number of energy level). There are maximum 8 electrons on the outermost energy level. This rule is called Octet rule. Below is the electronic configuration table of all of the known chemical elements.
Chemical element name | Atomic number | Number of Electrons on each Energy level | ||||||
---|---|---|---|---|---|---|---|---|
1st | 2nd | 3rd | 4th | 5th | 6th | 7th | ||
Hydrogen | 1 | 1 | - | - | - | - | - | - |
Helium | 2 | 2 | - | - | - | - | - | - |
Lithium | 3 | 2 | 1 | - | - | - | - | - |
Beryllium | 4 | 2 | 2 | - | - | - | - | - |
Boron | 5 | 2 | 3 | - | - | - | - | - |
Carbon | 6 | 2 | 4 | - | - | - | - | - |
Nitrogen | 7 | 2 | 5 | - | - | - | - | - |
Oxygen | 8 | 2 | 6 | - | - | - | - | - |
Fluorine | 9 | 2 | 7 | - | - | - | - | - |
Neon | 10 | 2 | 8 | - | - | - | - | - |
Sodium | 11 | 2 | 8 | 1 | - | - | - | - |
Magnesium | 12 | 2 | 8 | 2 | - | - | - | - |
Aluminum | 13 | 2 | 8 | 3 | - | - | - | - |
Silicon | 14 | 2 | 8 | 4 | - | - | - | - |
Phosphorus | 15 | 2 | 8 | 5 | - | - | - | - |
Chemical element name | Atomic number | Number of Electrons on each Energy level | ||||||
1st | 2nd | 3rd | 4th | 5th | 6th | 7th | ||
Sulfur | 16 | 2 | 8 | 6 | - | - | - | - |
Chlorine | 17 | 2 | 8 | 7 | - | - | - | - |
Argon | 18 | 2 | 8 | 8 | - | - | - | - |
Potassium | 19 | 2 | 8 | 8 | 1 | - | - | - |
Calcium | 20 | 2 | 8 | 8 | 2 | - | - | - |
Scandium | 21 | 2 | 8 | 9 | 2 | - | - | - |
Titanium | 22 | 2 | 8 | 10 | 2 | - | - | - |
Vanadium | 23 | 2 | 8 | 11 | 2 | - | - | - |
Chromium | 24 | 2 | 8 | 13 | 1 | - | - | - |
Manganese | 25 | 2 | 8 | 13 | 2 | - | - | - |
Iron | 26 | 2 | 8 | 14 | 2 | - | - | - |
Cobalt | 27 | 2 | 8 | 15 | 2 | - | - | - |
Nickel | 28 | 2 | 8 | 16 | 2 | - | - | - |
Copper | 29 | 2 | 8 | 18 | 1 | - | - | - |
Zinc | 30 | 2 | 8 | 18 | 2 | - | - | - |
Chemical element name | Atomic number | Number of Electrons on each Energy level | ||||||
1st | 2nd | 3rd | 4th | 5th | 6th | 7th | ||
Gallium | 31 | 2 | 8 | 18 | 3 | - | - | - |
Germanium | 32 | 2 | 8 | 18 | 4 | - | - | - |
Arsenic | 33 | 2 | 8 | 18 | 5 | - | - | - |
Selenium | 34 | 2 | 8 | 18 | 6 | - | - | - |
Bromine | 35 | 2 | 8 | 18 | 7 | - | - | - |
Krypton | 36 | 2 | 8 | 18 | 8 | - | - | - |
Rubidium | 37 | 2 | 8 | 18 | 8 | 1 | - | - |
Strontium | 38 | 2 | 8 | 18 | 8 | 2 | - | - |
Yttrium | 39 | 2 | 8 | 18 | 9 | 2 | - | - |
Zirconium | 40 | 2 | 8 | 18 | 10 | 2 | - | - |
Niobium | 41 | 2 | 8 | 18 | 12 | 1 | - | - |
Molybdenum | 42 | 2 | 8 | 18 | 13 | 1 | - | - |
Technetium | 43 | 2 | 8 | 18 | 14 | 1 | - | - |
Ruthenium | 44 | 2 | 8 | 18 | 15 | 1 | - | - |
Rhodium | 45 | 2 | 8 | 18 | 16 | 1 | - | - |
Chemical element name | Atomic number | Number of Electrons on each Energy level | ||||||
1st | 2nd | 3rd | 4th | 5th | 6th | 7th | ||
Palladium | 46 | 2 | 8 | 18 | 18 | 0 | - | - |
Silver | 47 | 2 | 8 | 18 | 18 | 1 | - | - |
Cadmium | 48 | 2 | 8 | 18 | 18 | 2 | - | - |
Indium | 49 | 2 | 8 | 18 | 18 | 3 | - | - |
Tin | 50 | 2 | 8 | 18 | 18 | 4 | - | - |
Antimony | 51 | 2 | 8 | 18 | 18 | 5 | - | - |
Tellurium | 52 | 2 | 8 | 18 | 18 | 6 | - | - |
Iodine | 53 | 2 | 8 | 18 | 18 | 7 | - | - |
Xenon | 54 | 2 | 8 | 18 | 18 | 8 | - | - |
Cesium | 55 | 2 | 8 | 18 | 18 | 8 | 1 | - |
Barium | 56 | 2 | 8 | 18 | 18 | 8 | 2 | - |
Lanthanum | 57 | 2 | 8 | 18 | 18 | 9 | 2 | - |
Cerium | 58 | 2 | 8 | 18 | 20 | 8 | 2 | - |
Praseodymium | 59 | 2 | 8 | 18 | 21 | 8 | 2 | - |
Neodymium | 60 | 2 | 8 | 18 | 22 | 8 | 2 | - |
Chemical element name | Atomic number | Number of Electrons on each Energy level | ||||||
1st | 2nd | 3rd | 4th | 5th | 6th | 7th | ||
Promethium | 61 | 2 | 8 | 18 | 23 | 8 | 2 | - |
Samarium | 62 | 2 | 8 | 18 | 24 | 8 | 2 | - |
Europium | 63 | 2 | 8 | 18 | 25 | 8 | 2 | - |
Gadolinium | 64 | 2 | 8 | 18 | 25 | 9 | 2 | - |
Terbium | 65 | 2 | 8 | 18 | 27 | 8 | 2 | - |
Dysprosium | 66 | 2 | 8 | 18 | 28 | 8 | 2 | - |
Holmium | 67 | 2 | 8 | 18 | 29 | 8 | 2 | - |
Erbium | 68 | 2 | 8 | 18 | 30 | 8 | 2 | - |
Thulium | 69 | 2 | 8 | 18 | 31 | 8 | 2 | - |
Ytterbium | 70 | 2 | 8 | 18 | 32 | 8 | 2 | - |
Lutetium | 71 | 2 | 8 | 18 | 32 | 9 | 2 | - |
Hafnium | 72 | 2 | 8 | 18 | 32 | 10 | 2 | - |
Tantalum | 73 | 2 | 8 | 18 | 32 | 11 | 2 | - |
Tungsten | 74 | 2 | 8 | 18 | 32 | 12 | 2 | - |
Rhenium | 75 | 2 | 8 | 18 | 32 | 13 | 2 | - |
Chemical element name | Atomic number | Number of Electrons on each Energy level | ||||||
1st | 2nd | 3rd | 4th | 5th | 6th | 7th | ||
Osmium | 76 | 2 | 8 | 18 | 32 | 14 | 2 | - |
Iridium | 77 | 2 | 8 | 18 | 32 | 15 | 2 | - |
Platinum | 78 | 2 | 8 | 18 | 32 | 17 | 1 | - |
Gold | 79 | 2 | 8 | 18 | 32 | 18 | 1 | - |
Mercury | 80 | 2 | 8 | 18 | 32 | 18 | 2 | - |
Thallium | 81 | 2 | 8 | 18 | 32 | 18 | 3 | - |
Lead | 82 | 2 | 8 | 18 | 32 | 18 | 4 | - |
Bismuth | 83 | 2 | 8 | 18 | 32 | 18 | 5 | - |
Polonium | 84 | 2 | 8 | 18 | 32 | 18 | 6 | - |
Astatine | 85 | 2 | 8 | 18 | 32 | 18 | 7 | - |
Radon | 86 | 2 | 8 | 18 | 32 | 18 | 8 | - |
Francium | 87 | 2 | 8 | 18 | 32 | 18 | 8 | 1 |
Radium | 88 | 2 | 8 | 18 | 32 | 18 | 8 | 2 |
Actinium | 89 | 2 | 8 | 18 | 32 | 18 | 9 | 2 |
Thorium | 90 | 2 | 8 | 18 | 32 | 18 | 10 | 2 |
Chemical element name | Atomic number | Number of Electrons on each Energy level | ||||||
1st | 2nd | 3rd | 4th | 5th | 6th | 7th | ||
Protactinium | 91 | 2 | 8 | 18 | 32 | 20 | 9 | 2 |
Uranium | 92 | 2 | 8 | 18 | 32 | 21 | 9 | 2 |
Neptunium | 93 | 2 | 8 | 18 | 32 | 23 | 8 | 2 |
Plutonium | 94 | 2 | 8 | 18 | 32 | 24 | 8 | 2 |
Americium | 95 | 2 | 8 | 18 | 32 | 25 | 8 | 2 |
Curium | 96 | 2 | 8 | 18 | 32 | 25 | 9 | 2 |
Berkelium | 97 | 2 | 8 | 18 | 32 | 26 | 9 | 2 |
Californium | 98 | 2 | 8 | 18 | 32 | 28 | 8 | 2 |
Einsteinium | 99 | 2 | 8 | 18 | 32 | 29 | 8 | 2 |
Fermium | 100 | 2 | 8 | 18 | 32 | 30 | 8 | 2 |
Mendelevium | 101 | 2 | 8 | 18 | 32 | 31 | 8 | 2 |
Nobelium | 102 | 2 | 8 | 18 | 32 | 32 | 8 | 2 |
Lawrencium | 103 | 2 | 8 | 18 | 32 | 32 | 9 | 2 |
Rutherfordium | 104 | 2 | 8 | 18 | 32 | 32 | 10 | 2 |
Dubnium | 105 | 2 | 8 | 18 | 32 | 32 | 11 | 2 |
Chemical element name | Atomic number | Number of Electrons on each Energy level | ||||||
1st | 2nd | 3rd | 4th | 5th | 6th | 7th | ||
Seaborgium | 106 | 2 | 8 | 18 | 32 | 32 | 12 | 2 |
Bohrium | 107 | 2 | 8 | 18 | 32 | 32 | 13 | 2 |
Hassium | 108 | 2 | 8 | 18 | 32 | 32 | 14 | 2 |
Meitnerium | 109 | 2 | 8 | 18 | 32 | 32 | 15 | 2 |
Darmstadtium | 110 | 2 | 8 | 18 | 32 | 32 | 16 | 2 |
Roentgenium | 111 | 2 | 8 | 18 | 32 | 32 | 17 | 2 |
Copernicium | 112 | 2 | 8 | 18 | 32 | 32 | 18 | 2 |
Ununtrium | 113 | 2 | 8 | 18 | 32 | 32 | 18 | 3 |
Flerovium | 114 | 2 | 8 | 18 | 32 | 32 | 18 | 4 |
Ununpentium | 115 | 2 | 8 | 18 | 32 | 32 | 18 | 5 |
Livermorium | 116 | 2 | 8 | 18 | 32 | 32 | 18 | 6 |
Ununseptium | 117 | 2 | 8 | 18 | 32 | 32 | 18 | 7 |
Ununoctium | 118 | 2 | 8 | 18 | 32 | 32 | 18 | 8 |