Atmospheric abundances for Jupiter

gas percent element measured (relative to hydrogen) Jupiter/Sun ratio

Equilibrium species

hydrogen (H₂) 86.4

helium (He) 13.56 helium-4 0.81

water (H₂O) \\> 0.026 oxygen \\> 0.82

methane (CH₄) 0.21 carbon 2.9 ± 0.5

ammonia (NH₃) 0.07 nitrogen 3.6 ± 0.5

hydrogen sulfide (H₂S) 0.007 sulfur 2.5 ± 0.2

hydrogen deuteride (HD) 0.004 deuterium no deuterium on Sun

neon (Ne) 0.002 neon-20 0.10 ± 0.01

argon (Ar) 0.002 argon-36 2.5 ± 0.5

krypton (Kr) 6 × 10^-8 krypton-84 2.7 ± 0.5

xenon (Xe) 6 × 10^-9 xenon-132 2.6 ± 0.5

Nonequilibrium species

phosphine (PH₃) 5 × 10^-5 phosphorus 0.8

germane (GeH₄) 6 × 10^-8 germanium 0.05

arsine (AsH₃) 2 × 10^-8 arsenic 0.5

carbon monoxide (CO) 1 × 10^-7

carbon dioxide (CO₂) detected in stratosphere

ethane (C₂H₆) 1-4 × 10^-4 (stratosphere)

acetylene (C₂H₂) 3-9 × 10^-6 (stratosphere)

ethylene (C₂H₄) 6 × 10^-7 (north polar region)

benzene (C₆H₆) 2 × 10^-7 (north polar region)

propyne (C₃H₄) 2 × 10^-7 (north polar region)

Detected species not yet quantified

methyl radical (CH₃) (polar regions)

propane (C₃H₈)

diacetylene (C₄H₂) (polar regions)