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Element

Element Abundances in Halley's Comet

( Number of atoms for every 100 atoms of magnesium )

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Hydrogen

2025 ± 385 atoms  

Oxygen

 890 ± 110 atoms  

Carbon

 814 ± 165 atoms  

Silicon

 185 ± 19 atoms   

Magnesium

 100 atoms        

Sulfur

  72 ± 23 atoms   

Iron

  52 ± 9 atoms    

Nitrogen

  42 ± 14 atoms   

Sodium

  10 ± 6 atoms    

Aluminum

   6.8 ± 1.7 atoms

Calcium

   6.3 ± 1.9 atoms

Nickel

   4.1 ± 2.1 atoms

Chromium

   0.9 ± 0.2 atoms

Manganese

   0.5 ± 0.2 atoms

Titanium

   0.4 ± 0.2 atoms

Cobalt

   0.3 ± 0.2 atoms

Potassium

   0.2 ± 0.1 atoms

Reference    (Click the button next to a value above to see complete citation information for that entry)

Jessberger, Elmar K., Alexander Christoforidis, and Jochen Kissel. "Aspects of the Major Element Composition of Halley's Dust." Nature, volume 332, number 21, 1988, pp. 691–695. doi:10.1038/332691a0