Alzrius said:
Well, I never thought so, but those things are subject to personal interpretation, which is why we're lucky enough to have the answer spelled out in type for us in the rulebooks.
Except I can't find any 3E FR publications that explicitly state that sun elves are chaotic good. The Player's Handbook and Monster Manual say that elves are usually chaotic good, but FR elves are different than the default D&D elves, and not just in height. Races of Faerun (and to a lesser extent, the Forgotten Realms Campaign Setting) list the attributes of the various elf subraces, but no alignments are given.
FR Elves aren't the only races that are different from their default D&D counterparts, though. Monsters of Faerun includes Faerunian dwarves (but oddly enough, no elves), and it lists the typical alignments of each dwarf subrace. Such as...
Shield Dwarf: Usually lawful good
Gold Dwarf: Usually lawful good
Duergar: Usually lawful evil
Arctic Dwarf: Usually lawful neutral.
Urdunnir: Usually neutral
Wild Dwarf: Usually lawful neutral.
Now, if it's possible for the dwarves to have such varied alignments, can't elves be the same way?
EDIT: Added in the part about dwarves.