Appendix XXV Names, Symbols and Atomic Weights of Elements

Element

Symbol

Atomic Weight

Element

Symbol

Atomic Weight

Actinium

Ac

[227]

Molybdenum

Mo

95.94

Aluminium

Al

26.981538

Neodymium

Nd

144.24

Americium

Am

[243]

Neon

Ne

20.1797

Antimony

Sb

121.760

Neptunium

Np

[237]

Argon

Ar

39.948

Nickel

Ni

58.6934

Arsenic

As

74.92160

Niobium

Nb

92.90638

Astatine

At

[210]

Nitrogen

N

14.0067

Barium

Ba

137.327

Nobelium

No

[259]

Berkelium

Bk

[247]

Osmium

Os

190.23

Beryllium

Be

9.012182

Oxygen

O

15.9994

Bismuth

Bi

208.98038

Palladium

Pd

106.42

Bohrium

Bh

[264]

Phosphorus

P

30.973761

Boron

B

10.811

Platinum

Pt

195.078

Bromine

Br

79.904

Plutonium

Pu

[244]

Cadmium

Cd

112.411

Polonium

Po

[209]

Caesium

Cs

132.90545

Potassium

K

39.0983

Calcium

Ca

40.078

Praseodymium

Pr

140.90765

Californium

Cf

[251]

Promethium

Pm

[145]

Carbon

C

12.0107

Protactinium

Pa

231.03588

Cerium

Ce

140.116

Radium

Ra

[226]

Chlorine

Cl

35.453

Radon

Rn

[222]

Chromium

Cr

51.9961

Rhenium

Re

186.207

Cobalt

Co

58.933200

Rhodium

Rh

102.90550

Copper

Cu

63.546

Roentgenium

Rg

[272]

Curium

Cm

[247]

Rubidium

Rb

85.4678

Darmstadtium

Ds

[281]

Ruthenium

Ru

101.07

Dubnium

Db

[262]

Rutherfordium

Rf

[261]

Dysprosium

Dy

162.500

Samarium

Sm

150.36

Einsteinium

Es

[252]

Scandium

Sc

44.955910

Erbium

Er

167.259

Seaborgium

Sg

[266]

Europium

Eu

151.964

Selenium

Se

78.96

Fermium

Fm

[257]

Silicon

Si

28.0855

Fluorine

F

18.9984032

Silver

Ag

107.8682

Francium

Fr

[223]

Sodium

Na

22.989770

Gadolinium

Gd

157.25

Strontium

Sr

87.62

Gallium

Ga

69.723

Sulfur

S

32.065

Germanium

Ge

72.64

Tantalum

Ta

180.9479

Gold

Au

196.96655

Technetium

Tc

[98]

Hafnium

Hf

178.49

Tellurium

Te

127.60

Hassium

Hs

[277]

Terbium

Tb

158.92534

Helium

He

4.002602

Thallium

Tl

204.3833

Holmium

Ho

164.93032

Thorium

Th

232.0381

Hydrogen

H

1.00794

Thulium

Tm

168.93421

Indium

In

114.818

Tin

Sn

118.71

Iodine

I

126.90447

Titanium

Ti

47.867

Iridium

Ir

192.217

Tungsten

W

183.84

Iron

Fe

55.845

Ununbium

Uub

[285]

Krypton

Kr

83.798

Ununhexium

Uuh

Lanthanum

La

138.9055

Ununoctium

Uuo

Lawrencium

Lr

[262]

Ununquadium

Uuq

[289]

Lead

Pb

207.2

Uranium

U

238.02891

Lithium

Li

[6.941]

Vanadium

V

50.9415

Lutetium

Lu

174.967

Xenon

Xe

131.293

Magnesium

Mg

24.3050

Ytterbium

Yb

173.04

Manganese

Mn

54.938049

Yttrium

Y

88.90585

Meitnerium

Mt

[268]

Zinc

Zn

65.409

Mendelevium

Md

[258]

Zirconium

Zr

91.224

Mercury

Hg

200.59