Constituent by number by mass
1H 91.0% 70.5% ("X")
4He 8.87% 27.5% ("Y")
16O 0.0477% 0.59%
12C 0.0326% 0.30%
14N 0.0102% 0.11%
20Ne 0.0100% 0.155%
28Si 0.0030% 0.065%
24Mg 0.0028% 0.051%
56Fe 0.0027% 0.117%
(etc.)
All "Metals" 0.13% 2.0% ("Z" = 1 - ("X" + "Y"))
About half of metals are in DUST, other half in "gas phase"