What percentage of the total mass in the solar nebula was composed of hydrogen and helium gas?

Answer

Roughly 98 percent

Hydrogen and helium, the two lightest and most abundant elements, constituted roughly 98 percent of the total mass present in the nebula.

What percentage of the total mass in the solar nebula was composed of hydrogen and helium gas?

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What Was The Composition Of The Solar Nebula? - Physics Frontier

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