A ranged basic attack with a light thrown weapon uses your Dexterity modifier for the attack and damage rolls, unless otherwise noted in the description of the power used.
Any magic light thrown weapon automatically returns to its wielder's hand after a ranged attack with the weapon is resolved. Catching a returning thrown weapon is a free action. If the wielder does not wish to catch the weapon, it drops in the wielder's space. [PH:232][RC:282]