I partially get the idea of the sentence but I'd really want to know the actually meaning of this phrase here. Plus, for that last clause I don't really get its sentence structure as well. Lastly, could you also give me some more example of the sentence using "is accounted for by"?

In a hydrogen atom consisting of only one proton and one electron, the greatest proportion by weight is accounted for by the proton.

Thank you!

  • The proton accounts for (makes up, is) most ("the greatest proportion") of the weight. For stylistic effect, the writer has turned that highlighted "indirect object" into the syntactic subject of the passive clause (with "the proton" relegated to the syntactic role of "agent"). – FumbleFingers Reinstate Monica Apr 12 at 16:20

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