Over the years Godzilla has possessed many powers and abilities to use against his foes. Godzilla is generally considered to be the most powerful kaiju, as is expressed by his title, "the King of the Monsters."
In Legendary Pictures' Godzilla, Godzilla's atomic breath was more of a focused, fiery shaped energy beam that Godzilla spews out. Godzilla only used it against the M.U.T.O.s after he had taken a severe beating and was already growing weaker, showing that Godzilla only uses it as a last resort against opponents he can't physically overpower on his own. Though it doesn't appear to have the same destructive properties as the versions prior, the blasts were strong enough to push, severely weaken, and eventually kill, the female M.U.T.O. While it may not have the destructive force of its predecessors, this version of Godzilla's atomic breath is still incredibly deadly in its own right. It is, however, entirely possible that Godzilla never used his atomic breath at its full power, seeing as how Godzilla was already extremely weak when he began using it, while the film's official novelization and an earlier screenplay suggest that the female M.U.T.O.'s EMP field interferes with his atomic breath, so whether or not it's capable of more is unknown at this point. The neon-blue glow on Godzilla's dorsal plates begins at the tail and goes all the way to the top of his neck.