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Chemical Elements Atomic Weight Valence and Number

Chemical Elements Atomic Weight, Valence and Number

Every elementary substance is made up of exceedingly small particles called atoms which are all alike and which cannot be further subdivided or broken up by chemical processes. It will be noted that this statement is virtually a definition of the term elementary substance and a limitation of the term chemical process. There are as many different classes or families of atoms as there are chemical elements.

¹ All the elements for which atomic weights listed are metals, except as otherwise indicated. No atomic weights are listed for most radioactive elements, as these elements have no fixed value.
² The atomic weights are based upon nuclidic mass of C¹² = 12.
³ Inert gas.
⁴ Metalloid.
⁵ Liquid. f Gas.
⁶ Most active gas.
⁷ Lightest gas.
⁸ Lightest metal.
⁹ Not placed.
¹⁰ Liquid at 25°C.
¹¹The atomic weight varies because of natural variations in the isotopic composition of the element. The observed ranges are boron, ± .003; carbon, ± 0.00005; hydrogen, ± 0.00001; oxygen, ± 0.0001; silicon, ± 0.001; sulfur, ± 0.003.
¹² The atomic weight is believed to have an experimental uncertainty of the following magnitude: bromine, ±0.001; chlorine, ±0.001; chromium, ±0.001; copper, ±0.001; iron, ±0.003; silver, ±0.001. For other elements, the last digit given is believed to be reliable to ±0.5.

Actinium	Ac
Aluminum	Al
Americium	Am
Antimony	Sb
Argon ³	Ar
Arsenic ⁴	As
Astatine	At
Barium	Ba
Berkelium	Bk
Beryllium	Be
Bismuth	Bi
Boron d	B
Bromine ⁵	Br
Cadmium	Cd
Calcium	Ca
Californium	Cf
Carbon ⁴	C
Cerium	Ce
Cesium ¹¹	Cs
Chlorine ⁶	Cl
Chromium	Cr
Cobalt	Co
Columbium (see Niobium)	-
Copper	Cu
Curium	Cm
Dysprosium	Dy
Einsteinium	Es
Erbium	Er
Europium	Eu
Fermium	Fm
Fluorine ⁷	F
Francium	Fr
Gadolinium	Gd
Gallium ¹¹	Ga
Germanium	Ge
Gold	Au
Hafnium	Hf
Helium ³	He
Holmium	Ho
Hydrogen ⁸	H
Indium	In
Iodine ⁴	I
Iridium	Ir
Iron	Fe
Krypton ³	Kr
Lanthanum	La
Lead	Pb
Lithium ⁹	Li
Lutetium	Lu
Magnesium	Mg
Manganese	Mn
Mendelevium	Md
Mercury ⁵	Hg
Molybdenum	Mo
Neodymium	Nd
Neon ³	Ne
Neptunium	Np
Nickel	Ni
Niobium	Nb
Nitrogen⁶	N
Nobelium	No
Osmium	Os
Oxygen⁶	O
Palladium	Pd
Phosphorus ⁴	P
Platinum	Pt
Plutonium	Pu
Polonium	Po
Potassium	K
Praseodymium	Pr
Promethium	Pm
Protactinium	Pa
Radium	Ra
Radon¹ ⁰	Rn
Rhenium	Re
Rhodium	Rh
Rubidium	Rb
Ruthenium	Ru
Samarium	Sm
Scandium	Sc
Selenium ⁴	Se
Silicon ⁴	Si
Silver	Ag
Sodium	Na
Strontium	Sr
Sulfur ⁴	S
Tantalum	Ta
Technetium	Tc
Tellurium ⁴	Te
Terbium	Tb
Thallium	Tl
Thorium	Th
Thulium	Tm
Tin	Sn
Titanium	Ti
Tungsten	W
Uranium	U
Vanadium	V
Xenon ³	Xe
Ytterbium	Yb
Yttrium	Y
Zinc	Zn
Zirconium	Zr

 

Source:

IUPAC and Butterworth Scientific Publications.

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