Periodic table chart
Atomic radius chart
Atomic radius is the distance from the nucleus to the outer edge of an atom’s electron cloud, given here in picometres (1 pm = 10⁻¹² m).
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- 1H120
- 2He140
- 3Li182
- 4Be153
- 5B192
- 6C170
- 7N155
- 8O152
- 9F135
- 10Ne154
- 11Na227
- 12Mg173
- 13Al184
- 14Si210
- 15P180
- 16S180
- 17Cl175
- 18Ar188
- 19K275
- 20Ca231
- 21Sc211
- 22Ti187
- 23V179
- 24Cr189
- 25Mn197
- 26Fe194
- 27Co192
- 28Ni163
- 29Cu140
- 30Zn139
- 31Ga187
- 32Ge211
- 33As185
- 34Se190
- 35Br183
- 36Kr202
- 37Rb303
- 38Sr249
- 39Y219
- 40Zr186
- 41Nb207
- 42Mo209
- 43Tc209
- 44Ru207
- 45Rh195
- 46Pd202
- 47Ag172
- 48Cd158
- 49In193
- 50Sn217
- 51Sb206
- 52Te206
- 53I198
- 54Xe216
- 55Cs343
- 56Ba268
- 57La240
- 58Ce235
- 59Pr239
- 60Nd229
- 61Pm236
- 62Sm229
- 63Eu233
- 64Gd237
- 65Tb221
- 66Dy229
- 67Ho216
- 68Er235
- 69Tm227
- 70Yb242
- 71Lu221
- 72Hf212
- 73Ta217
- 74W210
- 75Re217
- 76Os216
- 77Ir202
- 78Pt209
- 79Au166
- 80Hg209
- 81Tl196
- 82Pb202
- 83Bi207
- 84Po197
- 85At202
- 86Rn220
- 87Fr348
- 88Ra283
- 89Ac260
- 90Th237
- 91Pa243
- 92U240
- 93Np221
- 94Pu243
- 95Am244
- 96Cm245
- 97Bk244
- 98Cf245
- 99Es245
- 100Fm—
- 101Md—
- 102No—
- 103Lr—
- 104Rf—
- 105Db—
- 106Sg—
- 107Bh—
- 108Hs—
- 109Mt—
- 110Ds—
- 111Rg—
- 112Cn—
- 113Nh—
- 114Fl—
- 115Mc—
- 116Lv—
- 117Ts—
- 118Og—
LowHigh(pm)
No dataThe trend
Atoms get larger down a group, because each period adds a new electron shell, and smaller from left to right across a period, because the growing nuclear charge pulls the same shell closer. The largest atoms are the alkali metals at the bottom left and the smallest are near the top right. Radii are measured in several ways (covalent, metallic, van der Waals), so published values differ; this chart uses one consistent set.
Highest
- Francium (Fr)348 pm
- Caesium (Cs)343 pm
- Rubidium (Rb)303 pm
- Radium (Ra)283 pm
- Potassium (K)275 pm
Lowest
- Hydrogen (H)120 pm
- Fluorine (F)135 pm
- Zinc (Zn)139 pm
- Helium (He)140 pm
- Copper (Cu)140 pm
Atomic radius of every element
| No. | Element | Atomic radius (pm) |
|---|---|---|
| 1 | Hydrogen (H) | 120 |
| 2 | Helium (He) | 140 |
| 3 | Lithium (Li) | 182 |
| 4 | Beryllium (Be) | 153 |
| 5 | Boron (B) | 192 |
| 6 | Carbon (C) | 170 |
| 7 | Nitrogen (N) | 155 |
| 8 | Oxygen (O) | 152 |
| 9 | Fluorine (F) | 135 |
| 10 | Neon (Ne) | 154 |
| 11 | Sodium (Na) | 227 |
| 12 | Magnesium (Mg) | 173 |
| 13 | Aluminium (Al) | 184 |
| 14 | Silicon (Si) | 210 |
| 15 | Phosphorus (P) | 180 |
| 16 | Sulfur (S) | 180 |
| 17 | Chlorine (Cl) | 175 |
| 18 | Argon (Ar) | 188 |
| 19 | Potassium (K) | 275 |
| 20 | Calcium (Ca) | 231 |
| 21 | Scandium (Sc) | 211 |
| 22 | Titanium (Ti) | 187 |
| 23 | Vanadium (V) | 179 |
| 24 | Chromium (Cr) | 189 |
| 25 | Manganese (Mn) | 197 |
| 26 | Iron (Fe) | 194 |
| 27 | Cobalt (Co) | 192 |
| 28 | Nickel (Ni) | 163 |
| 29 | Copper (Cu) | 140 |
| 30 | Zinc (Zn) | 139 |
| 31 | Gallium (Ga) | 187 |
| 32 | Germanium (Ge) | 211 |
| 33 | Arsenic (As) | 185 |
| 34 | Selenium (Se) | 190 |
| 35 | Bromine (Br) | 183 |
| 36 | Krypton (Kr) | 202 |
| 37 | Rubidium (Rb) | 303 |
| 38 | Strontium (Sr) | 249 |
| 39 | Yttrium (Y) | 219 |
| 40 | Zirconium (Zr) | 186 |
| 41 | Niobium (Nb) | 207 |
| 42 | Molybdenum (Mo) | 209 |
| 43 | Technetium (Tc) | 209 |
| 44 | Ruthenium (Ru) | 207 |
| 45 | Rhodium (Rh) | 195 |
| 46 | Palladium (Pd) | 202 |
| 47 | Silver (Ag) | 172 |
| 48 | Cadmium (Cd) | 158 |
| 49 | Indium (In) | 193 |
| 50 | Tin (Sn) | 217 |
| 51 | Antimony (Sb) | 206 |
| 52 | Tellurium (Te) | 206 |
| 53 | Iodine (I) | 198 |
| 54 | Xenon (Xe) | 216 |
| 55 | Caesium (Cs) | 343 |
| 56 | Barium (Ba) | 268 |
| 57 | Lanthanum (La) | 240 |
| 58 | Cerium (Ce) | 235 |
| 59 | Praseodymium (Pr) | 239 |
| 60 | Neodymium (Nd) | 229 |
| 61 | Promethium (Pm) | 236 |
| 62 | Samarium (Sm) | 229 |
| 63 | Europium (Eu) | 233 |
| 64 | Gadolinium (Gd) | 237 |
| 65 | Terbium (Tb) | 221 |
| 66 | Dysprosium (Dy) | 229 |
| 67 | Holmium (Ho) | 216 |
| 68 | Erbium (Er) | 235 |
| 69 | Thulium (Tm) | 227 |
| 70 | Ytterbium (Yb) | 242 |
| 71 | Lutetium (Lu) | 221 |
| 72 | Hafnium (Hf) | 212 |
| 73 | Tantalum (Ta) | 217 |
| 74 | Tungsten (W) | 210 |
| 75 | Rhenium (Re) | 217 |
| 76 | Osmium (Os) | 216 |
| 77 | Iridium (Ir) | 202 |
| 78 | Platinum (Pt) | 209 |
| 79 | Gold (Au) | 166 |
| 80 | Mercury (Hg) | 209 |
| 81 | Thallium (Tl) | 196 |
| 82 | Lead (Pb) | 202 |
| 83 | Bismuth (Bi) | 207 |
| 84 | Polonium (Po) | 197 |
| 85 | Astatine (At) | 202 |
| 86 | Radon (Rn) | 220 |
| 87 | Francium (Fr) | 348 |
| 88 | Radium (Ra) | 283 |
| 89 | Actinium (Ac) | 260 |
| 90 | Thorium (Th) | 237 |
| 91 | Protactinium (Pa) | 243 |
| 92 | Uranium (U) | 240 |
| 93 | Neptunium (Np) | 221 |
| 94 | Plutonium (Pu) | 243 |
| 95 | Americium (Am) | 244 |
| 96 | Curium (Cm) | 245 |
| 97 | Berkelium (Bk) | 244 |
| 98 | Californium (Cf) | 245 |
| 99 | Einsteinium (Es) | 245 |
| 100 | Fermium (Fm) | — |
| 101 | Mendelevium (Md) | — |
| 102 | Nobelium (No) | — |
| 103 | Lawrencium (Lr) | — |
| 104 | Rutherfordium (Rf) | — |
| 105 | Dubnium (Db) | — |
| 106 | Seaborgium (Sg) | — |
| 107 | Bohrium (Bh) | — |
| 108 | Hassium (Hs) | — |
| 109 | Meitnerium (Mt) | — |
| 110 | Darmstadtium (Ds) | — |
| 111 | Roentgenium (Rg) | — |
| 112 | Copernicium (Cn) | — |
| 113 | Nihonium (Nh) | — |
| 114 | Flerovium (Fl) | — |
| 115 | Moscovium (Mc) | — |
| 116 | Livermorium (Lv) | — |
| 117 | Tennessine (Ts) | — |
| 118 | Oganesson (Og) | — |