Chemical elements*

element symbol atomic number atomic

weight

actinium Ac 89 (227)

aluminum (aluminium) Al 13 26.982

americium Am 95 (243)

antimony Sb 51 121.760

argon Ar 18 39.948

arsenic As 33 74.922

astatine At 85 (210)

barium Ba 56 137.327

berkelium Bk 97 (247)

beryllium Be 4 9.012

bismuth Bi 83 208.980

bohrium Bh 107 264

boron B 5 10.811

bromine Br 35 79.904

cadmium Cd 48 112.411

calcium Ca 20 40.078

californium Cf 98 (251)

carbon C 6 12.011

cerium Ce 58 140.116

cesium (caesium) Cs 55 132.905

chlorine Cl 17 35.453

chromium Cr 24 51.996

cobalt Co 27 58.933

copper Cu 29 63.546

curium Cm 96 (247)

darmstadtium Ds 110 (281)

dubnium Db 105 (262)

dysprosium Dy 66 162.50

einsteinium Es 99 (252)

erbium Er 68 167.26

europium Eu 63 151.964

fermium Fm 100 (257)

fluorine F 9 18.998

francium Fr 87 (223)

gadolinium Gd 64 157.25

gallium Ga 31 69.723

germanium Ge 32 72.61

gold Au 79 196.967

hafnium Hf 72 178.49

hassium Hs 108 (269)

helium He 2 4.003

holmium Ho 67 164.930

hydrogen H 1 1.008

indium In 49 114.818

iodine I 53 126.904

iridium Ir 77 192.217

iron Fe 26 55.845

krypton Kr 36 83.80

lanthanum La 57 138.906

lawrencium Lr 103 (262)

lead Pb 82 207.2

lithium Li 3 6.941

lutetium Lu 71 174.967

magnesium Mg 12 24.305

manganese Mn 25 54.938

meitnerium Mt 109 (268)

mendelevium Md 101 (258)

mercury Hg 80 200.59

molybdenum Mo 42 95.94

neodymium Nd 60 144.24

neon Ne 10 20.18

neptunium Np 93 (237)

nickel Ni 28 58.693

niobium Nb 41 92.906

nitrogen N 7 14.007

nobelium No 102 (259)

osmium Os 76 190.23

oxygen O 8 15.999

palladium Pd 46 106.42

phosphorus P 15 30.974

platinum Pt 78 195.078

plutonium Pu 94 (244)

polonium Po 84 (209)

potassium K 19 39.098

praseodymium Pr 59 140.908

promethium Pm 61 (145)

protactinium Pa 91 231.036

radium Ra 88 (226)

radon Rn 86 (222)

rhenium Re 75 186.207

rhodium Rh 45 102.906

roentgenium Rg 111 (272)

rubidium Rb 37 85.468

ruthenium Ru 44 101.07

rutherfordium Rf 104 (261)

samarium Sm 62 150.36

scandium Sc 21 44.956

seaborgium Sg 106 (266)

selenium Se 34 78.96

silicon Si 14 28.086

silver Ag 47 107.868

sodium Na 11 22.990

strontium Sr 38 87.62

sulfur (sulphur) S 16 32.066

tantalum Ta 73 180.948

technetium Tc 43 (98)

tellurium Te 52 127.60

terbium Tb 65 158.925

thallium Tl 81 204.383

thorium Th 90 232.038

thulium Tm 69 168.934

tin Sn 50 118.710

titanium Ti 22 47.867

tungsten (wolfram) W 74 183.84

ununbium Uub 112 (285)

ununhexium Uuh 116 (292)

ununoctium Uuo 118 (294)

ununpentium Uup 115 (288)

ununquadium Uuq 114 (289)

ununtrium Uut 113 (284)

uranium U 92 238.029

vanadium V 23 50.942

xenon Xe 54 131.29

ytterbium Yb 70 173.04

yttrium Y 39 88.906

zinc Zn 30 65.39

zirconium Zr 40 91.224

*Atomic weights are given to the nearest thousandth. Atomic weights of elements with no stable isotope are given as mass numbers, in parentheses, of the most stable isotope.