The ground-state electronic configuration of every element from hydrogen to oganesson, in the short noble-gas form used in NCERT. Tap an element for the full configuration, electrons per shell, and why exceptions like chromium and copper happen.
Test yourself: guess today's elementSix tries, one element a day| Z | Element | Configuration |
|---|---|---|
| 3 | Lithium (Li) | [He] 2s1 |
| 4 | Beryllium (Be) | [He] 2s2 |
| 5 | Boron (B) | [He] 2s2 2p1 |
| 6 | Carbon (C) | [He] 2s2 2p2 |
| 7 | Nitrogen (N) | [He] 2s2 2p3 |
| 8 | Oxygen (O) | [He] 2s2 2p4 |
| 9 | Fluorine (F) | [He] 2s2 2p5 |
| 10 | Neon (Ne) | [He] 2s2 2p6 |
| Z | Element | Configuration |
|---|---|---|
| 11 | Sodium (Na) | [Ne] 3s1 |
| 12 | Magnesium (Mg) | [Ne] 3s2 |
| 13 | Aluminium (Al) | [Ne] 3s2 3p1 |
| 14 | Silicon (Si) | [Ne] 3s2 3p2 |
| 15 | Phosphorus (P) | [Ne] 3s2 3p3 |
| 16 | Sulfur (S) | [Ne] 3s2 3p4 |
| 17 | Chlorine (Cl) | [Ne] 3s2 3p5 |
| 18 | Argon (Ar) | [Ne] 3s2 3p6 |
| Z | Element | Configuration |
|---|---|---|
| 19 | Potassium (K) | [Ar] 4s1 |
| 20 | Calcium (Ca) | [Ar] 4s2 |
| 21 | Scandium (Sc) | [Ar] 3d1 4s2 |
| 22 | Titanium (Ti) | [Ar] 3d2 4s2 |
| 23 | Vanadium (V) | [Ar] 3d3 4s2 |
| 24 | Chromium (Cr) | [Ar] 3d5 4s1 |
| 25 | Manganese (Mn) | [Ar] 3d5 4s2 |
| 26 | Iron (Fe) | [Ar] 3d6 4s2 |
| 27 | Cobalt (Co) | [Ar] 3d7 4s2 |
| 28 | Nickel (Ni) | [Ar] 3d8 4s2 |
| 29 | Copper (Cu) | [Ar] 3d10 4s1 |
| 30 | Zinc (Zn) | [Ar] 3d10 4s2 |
| 31 | Gallium (Ga) | [Ar] 3d10 4s2 4p1 |
| 32 | Germanium (Ge) | [Ar] 3d10 4s2 4p2 |
| 33 | Arsenic (As) | [Ar] 3d10 4s2 4p3 |
| 34 | Selenium (Se) | [Ar] 3d10 4s2 4p4 |
| 35 | Bromine (Br) | [Ar] 3d10 4s2 4p5 |
| 36 | Krypton (Kr) | [Ar] 3d10 4s2 4p6 |
| Z | Element | Configuration |
|---|---|---|
| 37 | Rubidium (Rb) | [Kr] 5s1 |
| 38 | Strontium (Sr) | [Kr] 5s2 |
| 39 | Yttrium (Y) | [Kr] 4d1 5s2 |
| 40 | Zirconium (Zr) | [Kr] 4d2 5s2 |
| 41 | Niobium (Nb) | [Kr] 4d4 5s1 |
| 42 | Molybdenum (Mo) | [Kr] 4d5 5s1 |
| 43 | Technetium (Tc) | [Kr] 4d5 5s2 |
| 44 | Ruthenium (Ru) | [Kr] 4d7 5s1 |
| 45 | Rhodium (Rh) | [Kr] 4d8 5s1 |
| 46 | Palladium (Pd) | [Kr] 4d10 |
| 47 | Silver (Ag) | [Kr] 4d10 5s1 |
| 48 | Cadmium (Cd) | [Kr] 4d10 5s2 |
| 49 | Indium (In) | [Kr] 4d10 5s2 5p1 |
| 50 | Tin (Sn) | [Kr] 4d10 5s2 5p2 |
| 51 | Antimony (Sb) | [Kr] 4d10 5s2 5p3 |
| 52 | Tellurium (Te) | [Kr] 4d10 5s2 5p4 |
| 53 | Iodine (I) | [Kr] 4d10 5s2 5p5 |
| 54 | Xenon (Xe) | [Kr] 4d10 5s2 5p6 |
| Z | Element | Configuration |
|---|---|---|
| 55 | Caesium (Cs) | [Xe] 6s1 |
| 56 | Barium (Ba) | [Xe] 6s2 |
| 57 | Lanthanum (La) | [Xe] 5d1 6s2 |
| 58 | Cerium (Ce) | [Xe] 4f1 5d1 6s2 |
| 59 | Praseodymium (Pr) | [Xe] 4f3 6s2 |
| 60 | Neodymium (Nd) | [Xe] 4f4 6s2 |
| 61 | Promethium (Pm) | [Xe] 4f5 6s2 |
| 62 | Samarium (Sm) | [Xe] 4f6 6s2 |
| 63 | Europium (Eu) | [Xe] 4f7 6s2 |
| 64 | Gadolinium (Gd) | [Xe] 4f7 5d1 6s2 |
| 65 | Terbium (Tb) | [Xe] 4f9 6s2 |
| 66 | Dysprosium (Dy) | [Xe] 4f10 6s2 |
| 67 | Holmium (Ho) | [Xe] 4f11 6s2 |
| 68 | Erbium (Er) | [Xe] 4f12 6s2 |
| 69 | Thulium (Tm) | [Xe] 4f13 6s2 |
| 70 | Ytterbium (Yb) | [Xe] 4f14 6s2 |
| 71 | Lutetium (Lu) | [Xe] 4f14 5d1 6s2 |
| 72 | Hafnium (Hf) | [Xe] 4f14 5d2 6s2 |
| 73 | Tantalum (Ta) | [Xe] 4f14 5d3 6s2 |
| 74 | Tungsten (W) | [Xe] 4f14 5d4 6s2 |
| 75 | Rhenium (Re) | [Xe] 4f14 5d5 6s2 |
| 76 | Osmium (Os) | [Xe] 4f14 5d6 6s2 |
| 77 | Iridium (Ir) | [Xe] 4f14 5d7 6s2 |
| 78 | Platinum (Pt) | [Xe] 4f14 5d9 6s1 |
| 79 | Gold (Au) | [Xe] 4f14 5d10 6s1 |
| 80 | Mercury (Hg) | [Xe] 4f14 5d10 6s2 |
| 81 | Thallium (Tl) | [Xe] 4f14 5d10 6s2 6p1 |
| 82 | Lead (Pb) | [Xe] 4f14 5d10 6s2 6p2 |
| 83 | Bismuth (Bi) | [Xe] 4f14 5d10 6s2 6p3 |
| 84 | Polonium (Po) | [Xe] 4f14 5d10 6s2 6p4 |
| 85 | Astatine (At) | [Xe] 4f14 5d10 6s2 6p5 |
| 86 | Radon (Rn) | [Xe] 4f14 5d10 6s2 6p6 |
| Z | Element | Configuration |
|---|---|---|
| 87 | Francium (Fr) | [Rn] 7s1 |
| 88 | Radium (Ra) | [Rn] 7s2 |
| 89 | Actinium (Ac) | [Rn] 6d1 7s2 |
| 90 | Thorium (Th) | [Rn] 6d2 7s2 |
| 91 | Protactinium (Pa) | [Rn] 5f2 6d1 7s2 |
| 92 | Uranium (U) | [Rn] 5f3 6d1 7s2 |
| 93 | Neptunium (Np) | [Rn] 5f4 6d1 7s2 |
| 94 | Plutonium (Pu) | [Rn] 5f6 7s2 |
| 95 | Americium (Am) | [Rn] 5f7 7s2 |
| 96 | Curium (Cm) | [Rn] 5f7 6d1 7s2 |
| 97 | Berkelium (Bk) | [Rn] 5f9 7s2 |
| 98 | Californium (Cf) | [Rn] 5f10 7s2 |
| 99 | Einsteinium (Es) | [Rn] 5f11 7s2 |
| 100 | Fermium (Fm) | [Rn] 5f12 7s2 |
| 101 | Mendelevium (Md) | [Rn] 5f13 7s2 |
| 102 | Nobelium (No) | [Rn] 5f14 7s2 |
| 103 | Lawrencium (Lr) | [Rn] 5f14 7s2 7p1 |
| 104 | Rutherfordium (Rf) | [Rn] 5f14 6d2 7s2 |
| 105 | Dubnium (Db) | [Rn] 5f14 6d3 7s2 |
| 106 | Seaborgium (Sg) | [Rn] 5f14 6d4 7s2 |
| 107 | Bohrium (Bh) | [Rn] 5f14 6d5 7s2 |
| 108 | Hassium (Hs) | [Rn] 5f14 6d6 7s2 |
| 109 | Meitnerium (Mt) | [Rn] 5f14 6d7 7s2 |
| 110 | Darmstadtium (Ds) | [Rn] 5f14 6d8 7s2 |
| 111 | Roentgenium (Rg) | [Rn] 5f14 6d9 7s2 |
| 112 | Copernicium (Cn) | [Rn] 5f14 6d10 7s2 |
| 113 | Nihonium (Nh) | [Rn] 5f14 6d10 7s2 7p1 |
| 114 | Flerovium (Fl) | [Rn] 5f14 6d10 7s2 7p2 |
| 115 | Moscovium (Mc) | [Rn] 5f14 6d10 7s2 7p3 |
| 116 | Livermorium (Lv) | [Rn] 5f14 6d10 7s2 7p4 |
| 117 | Tennessine (Ts) | [Rn] 5f14 6d10 7s2 7p5 |
| 118 | Oganesson (Og) | [Rn] 5f14 6d10 7s2 7p6 |