atoms

See also: isotopes

drawing comparing size of a cesium and hydrogen atom

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
arsenic 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  

Resources

www.chemsoc.org/viselements/

Both the content and design of this site created by the Royal Society of Chemistry (UK) are truly exceptional. The animations, however, are huge (hydrogen is about 12 megabytes), so you may wish to download and save those for the elements that interest you. Or buy the CD for $37 (20 pounds).

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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