Zidlicky gave the Predators a 1-0 lead at 13:52 of the first period, the first of three goals allowed by Ondrej Pavelec. Fred Braithwaite gave up the other two.
Four goals were scored in the second period, three by Nashville. Arnott scored 46 seconds in, and Vernon Fiddler added a goal at 6:31. J.P. Dumont assisted on both goals, and Alexander Sulzer netted the third of the frame at 15:29.
Darren Haydar cut the Thrashers' deficit to 3-2 at 11:35 of the second.
Ryan Suter scored on the power play at 12:14 of the third period to seal the game for the Predators. Brent Sterling added a goal for Atlanta at 16:07.
Mason, the Predators' top goalie, stopped 11 of 13 shots in 31 minutes, 35 seconds of action.