TABLE 530. 



Tables 630-631. 

 Periodic System of the Elements. 



409 



TABLE 531. — Atomic Numbers.* 



1 Hydrogen 



2 Helium 



3 Lithium 



4 Beryllium 



5 Boron 



6 Carbon 



7 Nitrogen 



8 Oxygen 



9 Fluorine 



10 Neon 



11 Sodium 



12 Magnesium 



13 Aluminum 



14 Silicon 



15 Phosphorus 



16 Sulphur 



17 Chlorine 



18 Argon 



19 Potassium 



20 Calcium 



21 Scandium 



22 Titanium 



23 Vanadium 



24 Chromium 



25 Manganese 



26 Iron 



27 Cobalt 



28 Nickel 



29 Copper 



30 Zinc 



31 Gallium 



32 Germanium 



33 Arsenic 



34 Selenium 



35 Bromine 



36 Krypton 



37 Rubidium 



38 Strontium 



39 Yttrium 



40 Zirconium 



41 Niobium t 



42 Molybdenum 

 43 



44 Ruthenium 



45 Rhodium 



46 Palladium 



47 Silver 



48 Cadmium 



49 Indiimi 

 5° Tin 



51 Antimony 



52 Tellurium 



53 Iodine 



54 Xenon 



55 Caesium 



56 Barium 



57 Lanthanum 



58 Cerium 



59 Praseodymium 



60 Neodymium 

 61 



62 Samarium 



63 Europium 



64 Gadolinium 



65 Terbium 



66 Dysprosium 



67 Holmium 



68 Erbium 



69 Thulium 



70 Ytterbium 



71 Lutecium 



72 Celtiiim 



73 Tantalum 



74 Tungsten 

 75 



* Quoted from Millikan's The Electron, 191 7. 

 SMITHSONIAN Tables. 



t Gluciniimi. 



76 Osmium 



77 Iridium 



78 Platinum 



79 Gold 



80 Mercury 



81 Thalium 



82 Lead 



83 Bismuth 



84 Polonium 

 85 



86 Emanation 

 87 



88 Radium 



89 Actinium 



90 Thorium 



91 Uranium X2 



92 Uranium 



X Columbium. 



