Periodic Table of the Elements

Alkali Metals Alkaline Earth Metals Transition Metals Other Metals Nonmetals Noble Gases Lanthanoids Actinoids

C

Br

He

Tc

hydrogen 1 H 1.00794

solid

liquid

gas

synthetic

helium 2 He 4.002602

lithium 3 Li 6.941

beryllium 4 Be 9.012182

key

element name atomic number symbol atomic weight

boron 5 B 10.811

carbon 6 C 12.0107

nitrogen 7 N 14.00674

oxygen 8 O 15.9994

fluorine 9 F 18.9984

neon 10 Ne 20.1797

sodium 11 Na 22.98977

magnesium 12 Mg 24.3050

aluminium 13 Al 26.981538

silicon 14 Si 28.0855

phosphorus 15 P 30.97376

sulphur 16 S 32.065

chlorine 17 Cl 35.453

argon 18 Ar 39.984

potassium 19 K 39.0983

calcium 20 Ca 40.078

scandium 21 Sc 44.95591

titanium 22 Ti 47.867

vanadium 23 V 50.9415

chromium 24 Cr 51.9961

manganese 25 Mn 54.93805

iron 26 Fe 55.845

cobalt 27 Co 58.9332

nickel 28 Ni 58.6934

copper 29 Cu 63.546

zinc 30 Zn 65.409

gallium 31 Ga 69.723

germanium 32 Ge 72.64

arsenic 33 As 74.9216

selenium 34 Se 78.96

bromine 35 Br 79.904

krypton 36 Kr 83.798

rubidium 37 Rb 85.4678

strontium 38 Sr 87.62

yttrium 39 Y 88.90585

zirconium 40 Zr 91.225

niobium 41 Nb 92.90638

molybdenum 42 Mo 95.94

technetium 43 Tc [98]

ruthenium 44 Ru 101.07

rhodium 45 Rh 102.9055

palladium 46 Pd 106.42

silver 47 Ag 107.8682

cadmium 48 Cd 112.411

indium 49 In 114.818

tin 50 Sn 118.710

antimony 51 Sb 121.760

tellurium 52 Te 127.60

iodine 53 I 126.9045

xenon 54 Xe 131.293

caesium 55 Cs 132.90545

barium 56 Ba 137.327

lutetium 71 Lu 174.967

hafnium 72 Hf 1.00794

tantalum 73 Ta 180.9479

tungsten 74 W 183.84

rhenium 75 Re 186.207

osmium 76 Os 190.23

iridium 77 Ir 192.217

platinum 78 Pt 195.078

gold 79 Au 196.96655

mercury 80 Hg 200.59

thallium 81 Tl 204.3833

lead 82 Pb 207.2

bismuth 83 Bi 208.980

polonium 84 Po [209]

astatine 85 At [210]

radon 86 Rn [222]

francium 87 Fr [223]

radium 88 Ra [226]

lawrencium 103 Lr [262]

rutherfordium 104 Rf [261]

dubnium 105 Db [262]

seaborgium 106 Sg [266]

bohrium 107 Bh [264]

hassium 108 Hs [269]

meitnerium 109 Mt [268]

darmstadtium 110 Ds [271]

roentgenium 111 Rg [272]

ununbium 112 Uub [285]

ununquadium 114 Uuq [289]

lanthanum 57 La 138.9055

cerium 58 Ce 140.116

praseodymium 59 Pr 140.90765

neodymium 60 Nd 144.24

promethium 61 Pm [145]

samarium 62 Sm 150.36

europium 63 Eu 151.964

gadolinium 64 Gd 157.25

terbium 65 Tb 158.9253

dysprosium 66 Dy 162.50

holmium 67 Ho 164.930

erbium 68 Er 167.259

thulium 69 Tm 168.934

ytterbium 70 Yb 173.04

actinium 89 Ac [227]

thorium 90 Th 232.038

protactinium 91 Pa 231.0359

uranium 92 U 238.0289

neptunium 93 Np [237]

plutonium 94 Pu [244]

americium 95 Am [243]

curium 96 Cm [247]

berkelium 97 Bk [247]

californium 98 Cf [251]

einsteinium 99 Es [252]

fermium 100 Fm [257]

mendelevium 101 Md [258]

nobelium 102 No [259]

Notes: Elements with atomic weights in square brackets have no stable isotopes. Different sources list different atomic weights for elements. The difference arises from the differing atomic weights of various isotopes. We have tried to list the most stable isotope. For example, some sources list the atomic weight of seaborgium as 263 and others 266. The most stable isotope appears have an atomic weight of 266 so we list that weight here. Roentgenium is still the unofficial name of element 111 but it is the one recommended by the IUPAC so we list it here instead of the generic ‘unununium’. Aluminum, cesium, and sulfur are the American spellings for aluminium, caesium, and sulphur. Announcements of discoveries of elements 116 and 118 were made and later retracted. This table was downloaded from http://www.science-teachers.com/printable_periodic_tables.htm