2/10, it would only make a black hole.
PBRD, Pacbrad: Causes every element to turn into another element, and messes up every interaction between elements.
9/10 teehee
BLBR Bad Luck Brian. Forces any radioactive element to go off.
6/10
DMCR, Demon Core: It looks like an ordinary pile of plutonium, until it spontaneously explodes in your face.
1/10 clne+neut/phot
wsng white sing. Instead of sucking everything inwards, it forces everything outwards.
EDIT: credit to Silv3rSoul.
9/10
AGRE: Al Gore. Flies around the screen on a TRON particle, causing everything to warm six degrees and makes all ice melt. It also slowly floods the lower half of the screen with SLTW, and the top half with CO2.
What does that stand for?