Properties of metallic hydrogen

Given the possibility that metallic hydrogen may have recently been produced, and the massive media bloviation that followed, I am curious about some of the "properties" that I heard from multiple media outlets. 


1. Does metallic hydrogen decompose to mono-atomic hydrogen, then recombine to diatomic hydrogen?
2. How much energy is produced by the decomposition?
3. How certain are we that it will be stable(ish) at STP?


