CHEMISTRY OF FARM PRACTICE 



TABLE I. THE COMMON ELEMENTS 



Elements. 



Symbols. 



Atomic Weights 



Usual Valence. 



Aluminium Al 



Antimony Sb 



Arsenic As 



Barium Ba 



Bismuth Bi 



Boron B 



Bromine Br 



Calcium Ca 



Carbon C 



Chlorine Cl 



Chromium Cr 



Cobalt Co 



Copper Cu 



Fluorine F 



Gold Au 



Hydrogen H 



Iodine I 



Iron Fe 



Lead Pb 



Lithium Li 



Magnesium Mg 



Manganese Mn 



Mercury Hg 



Nickel Ni 



Nitrogen N 



Oxygen O 



Phosphorus P 



Platinum Pt 



Potassium K 



Radium Ra 



Silicon Si 



Silver Ag 



Sodium Na 



Sulphur S 



Tin Sn 



Zinc. . Zn 



27.1 



120.2 

 74.96 



137.37 



208.0 

 11.0 

 79.92 

 40.07 

 12.0 

 35.46 

 52.0 

 58.97 

 63.57 

 19.0 



197.2 

 1.0C8 



126.92 

 55.84 



207.1 



6.94 

 24.32 

 54.93 



200.6 

 58.68 

 14.01 

 16.0 

 31.04 



195.2 

 39.1 



226.4 

 28.3 



107.88 

 23.0 

 32.07 



119.0 

 65.37 



3 



3 or 5 

 3 or 5 



2 



3 



3 



1 



2 



4 



1 



3 



2 



2 



1 



3 



1 



1 

 2 or 3 



2 



1 



2 

 2, 4 or 6 



1 or 2 



2 or 3 



3 or 5 

 2 



3 or 5 

 2 or 4 



1 



2 



4 



1 



1 



2 

 2 or 4 



2 



