Number Six (Teresa Palmer) carries a Lorian energy pistol which, since she's a good guy, fires blue energy rounds. She draws it after discarding her M79 and uses it for the duration of the battle in the school.
The Mogadorian's standard-issue weapon a a large assault rifle that, since they're bad guys, fire red energy bolts. The weapon seems to be partialy based off of a Mk. 46 machine gun and can fire semi-automatic or three-round bursts.
Some of the Mogadorians carry a smaller rifle which has the trigger unit concealed in a housing they stick their hand into. Sam obtains one and later unhesitatingly blasts a Mogadorian.
While they are not strictly speaking weapons, the Commander's power cells for his heavy blaster are detonated by Number 4's telekinesis, obliterating the Commander and wrecking the football stadium.
A Mogadorian throws a fictional energy grenade at Number Six in the school cafeteria. In true Hollywood fashion, the grenade produces a massive fireball (red, of course) and throws Six twenty feet with no injuries.
