Element Abundances in Halley's Comet

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Element

( 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 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