Bullying is a serious problem in schools, but it is not always easy to spot. There are many studies out that show how teachers can recognize these behaviors and what can be done about reducing this behavior across the board.
This App "Noise Control" magically ask your students & kids to keep quiet on your behalf..... It's so magical that teachers found that students are more willing to corporate in classroom activities.... http://theteachingpalette.com/2010/01/29/shhh-noise-control-2/
Teaching Kids to Interrupt Appropriately (or wait their turn) along with activities that coincide with the book -My Mouth is a Volcano While tailored to pre-schoolers, the suggestions should also work with Elem.