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Naturally Occurring Elements

Element Symbol Atomic No. Atomic Weight Element Symbol Atomic No. Atomic weight  
Hydrogen*
H 1 1.008 Silver Ag 47 107.87
 
Helium He 2 4.003 Cadmium Cd 48 112.4
 
Lithium Li 3 6.94 Indium In 49 114.82
 
Beryllium Be 4 9.012 Tin Sn 50 118.7  
Boron B 5 10.81 Antimony Sb 51 121.75
 
Carbon C 6 12.01 Tellurium Te 52 127.6  
Nitrogen N 7 14.007 Iodine I 53 126.9  
Oxygen O 8 15.999 Xenon Xe 54 131.3
 
Fluorine F 9 18.998 Cesium Cs 55 132.91  
Neon
Ne 10 20.179 Barium Ba 56 137.34
 
Sodium Na 11 22.99 Lanthanum La 57 138.91  
Magnesium Mg 12 24.305 Cerium Ce 58 140.12
 
Aluminum Al 13 26.98 Praseodymium Pr 59 140.91  
Silicon Si 14 28.08 Neodymium Nd 60 144.24  
Phosphorus P 15 30.97 Promethium Pm 61 [145.]**  
Sulfur S 16 32.06 Samarium Sm 62 150.4  
Chlorine Cl 17 35.45 Europium Eu 63 151.96  
Argon A 18 39.948 Gadolinium Gd 64 157.25
 
Potassium K 19 39.102 Terbium Tb 65 158.9
 
Calcium Ca 20 40.08 Dysprosium Dy 66 162.5
 
Scandium Sc 21 44.96 Holmium Ho 67 164.93
 
Titanium Ti 22 47.9 Erbium Er 68 167.26  
Vanadium V 23 50.94 Thulium Tm 69 168.9
 
Chromium
Cr 24 51.996 Ytterbium Yb 70 173.04  
Manganese
Mn 25 54.94 Lutetium Lu 71 174.97  
Iron
Fe 26 55.85 Hafnium Hf 72 178.49  
Cobalt Co 27 58.93 Tantalum Ta 73 180.94  
Nickel Ni 28 58.71 Tungsten W 74 183.85
 
Copper Cu 29 63.55 Rhenium Re 75 186.2
 
Zinc Zn 30 65.37 Osmium Os 76 190.2
 
Gallium Ga 31 69.72 Iridium Ir 77 192.2
 
Germanium Ge 32 72.6 Platinum Pt 78 195.09
 
Arsenic As 33 74.92 Gold Au 79 197  
Selenium Se 34 78.96 Mercury Hg 80 200.59
 
Bromine Br 35 79.904 Thallium Ti 81 204.37  
Krypton Kr 36 83.8 Lead Pb 82 207.2
 
Rubidium Rb 37 85.47 Bismuth Bi 83 209
 
Strontium Sr 38 87.62 Polonium Po 84 [209]
 
Yttrium Y 39 88.91 Astatine At 85 [210]
 
Zirconium Zr 40 91.22 Radon Rn 86 [222]
 
Niobium Nb 41 92.91 Francium Fr 87 [223]  
Molybdenum
Mo 42 95.94 Radium Ra 88 226.03
 
Technetium Tc 43 98.91 Actinium Ac 89 [227]
 
Ruthenium Ru 44 101.07 Thorium Th 90 232.04
 
Rhodium Rh 45 102.91 Protactinium Pa 91 231
 
Palladium Pd 46 106.4 Uranium U 92 238.03  

* Elements in bold type essential to plants

** Values in brackets are mass nos. of most stable known isotope.

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