The largest and smallest atoms.
What does it mean to measure the "size" of an atom?
Element | Symbol | Atomic number |
Atomic radius in nanometers |
---|---|---|---|
hydrogen | H | 1 | 0.037 |
helium | He | 2 | 0.05 |
lithium | Li | 3 | 0.152 |
beryllium | Be | 4 | 0.111 |
boron | B | 5 | 0.088 |
carbon | C | 6 | 0.077 |
nitrogen | N | 7 | 0.070 |
oxygen | O | 8 | 0.066 |
fluorine | F | 9 | 0.064 |
neon | Ne | 10 | 0.070 |
sodium | Na | 11 | 0.186 |
magnesium | Mg | 12 | 0.160 |
aluminum | Al | 13 | 0.143 |
silicon | Si | 14 | 0.117 |
phosphorus | P | 15 | 0.110 |
sulfur | S | 16 | 0.104 |
chlorine | Cl | 17 | 0.099 |
argon | Ar | 18 | 0.094 |
potassium | K | 19 | 0.231 |
calcium | Ca | 20 | 0.197 |
scandium | Sc | 21 | 0.162 |
titanium | Ti | 22 | 0.146 |
vanadium | V | 23 | 0.134 |
chromium | Cr | 24 | 0.127 |
manganese | Mn | 25 | 0.126 |
iron | Fe | 26 | 0.126 |
cobalt | Co | 27 | 0.125 |
nickel | Ni | 28 | 0.124 |
copper | Cu | 29 | 0.128 |
zinc | Zn | 30 | 0.138 |
gallium | Ga | 31 | 0.122 |
germanium | Ge | 32 | 0.122 |
arsenic | As | 33 | 0.121 |
selenium | Se | 34 | 0.117 |
bromine | Br | 35 | 0.114 |
krypton | Kr | 36 | 0.109 |
rubidium | Rb | 37 | 0.244 |
strontium | St | 38 | 0.215 |
yittrium | Y | 39 | 0.180 |
zirconium | Zr | 40 | 0.160 |
niobium | Nb | 41 | 0.146 |
molybdenum | Mo | 42 | 0.139 |
technetium | Tc | 43 | 0.136 |
ruthenium | Ru | 44 | 0.134 |
rhodium | Rh | 45 | 0.134 |
palladium | Pd | 46 | 0.137 |
silver | Ag | 47 | 0.144 |
cadmium | Cd | 48 | 0.154 |
indium | In | 49 | 0.162 |
tin | Sn | 50 | 0.140 |
antimony | Sb | 51 | 0.141 |
tellurium | Te | 52 | 0.137 |
iodine | I | 53 | 0.133 |
xenon | Xe | 54 | 0.130 |
cesium | Cs | 55 | 0.262 |
barium | Ba | 56 | 0.217 |
lanthanum | La | 57 | 0.187 |
cerium | Ce | 58 | 0.182 |
praseodymium | Pr | 59 | 0.182 |
neodymium | Nd | 60 | 0.182 |
promethium | Pm | 61 | |
samarium | Sm | 62 | |
europium | Eu | 63 | 0.204 |
gadolinium | Gd | 64 | 0.179 |
terbium | Tb | 65 | 0.177 |
dysprosium | Dy | 66 | 0.177 |
holmium | Ho | 67 | 0.176 |
erbium | Er | 68 | 0.175 |
thulium | Tm | 69 | 0.174 |
ytterbium | Yb | 70 | 0.193 |
lutetium | Lu | 71 | 0.174 |
hafnium | Hf | 72 | 0.158 |
tantalum | Ta | 73 | 0.146 |
tungsten | W | 74 | 0.139 |
rhenium | Re | 75 | 0.137 |
osmium | Os | 76 | 0.135 |
iridium | Ir | 77 | 0.136 |
platinum | Pt | 78 | 0.138 |
gold | Au | 79 | 0.144 |
mercury | Hg | 80 | 0.157 |
thallium | Tl | 81 | 0.171 |
lead | Pb | 82 | 0.175 |
bismuth | Bi | 83 | 0.146 |
polonium | Po | 84 | 0.15 |
astatine | At | 85 | 0.14 |
radon | Rn | 86 | 0.14 |
francium | Fr | 87 | 0.27 |
radium | Ra | 88 | 0.220 |
actinium | Ac | 89 | 0.2 |
thorium | Th | 90 | 0.180 |
protactinium | Pa | 91 | |
uranium | U | 92 | 0.14 |
neptunium | Np | 93 | |
plutonium | Pu | 94 | |
americium | Am | 95 | |
curium | Cm | 96 | |
berkelium | Bk | 97 | |
californium | Cf | 98 | |
einsteinium | Es | 99 | |
fermium | Fm | 100 | |
mendelevium | Md | 101 | |
nobelium | No | 102 | |
lawrencium | Lr | 103 | |
rutherfordium | Rf | 104 | |
dubnium | Db | 105 | |
seaborgium | Sg | 106 | |
bohrium | Bh | 107 | |
hassium | Hs | 108 | |
meitnerium | Mt | 109 | |
darmstadtium | Ds | 110 | |
roentgenium | Rg | 111 | |
copernicium | Cn | 112 | |
nihonium | Nh | 113 | |
flerovium | Fl | 114 | |
moscovium | Mc | 115 | |
livermorium | Lv | 116 | |
tennessine | Ts | 117 | |
oganesson | Og | 118 |
Both the content and design of this site created by the Royal Society of Chemistry (UK) are truly exceptional. Be sure to check out the videos.
The current version is at least the second. The animations in the original were huge for the time (hydrogen was about 12 megabytes), so downloading and saving them was a wise use of bandwidth—or one could buy a CD for $37 (20 pounds). Now the videos stream and the CD seems no longer on offer. We wish we had saved one of the first edition videos, for the sake of comparison.
Philip Ball.
The Ingredients. A Guided Tour of the Elements.
Oxford University Press, 2003.
John Emsley.
Nature's Building Blocks. An A-Z Guide to the Elements.
Oxford University Press, 2002.
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Last revised: 27 May 2019.