Maybe it's my non-native English letting me down here, but what other, non-noun, non-chemical element Phosphorous is there?
The chemical element is spelled without the U (even in British English!): Phosphorus.
The noun also has that U, it's the O next to it that it doesn't have.
And still yet, the article's diagram's caption does not use the correct word!! "Currently known Galactic distribution of phosphorous."