What would be the damage if every atom on the planet split at once?
Hydrogen can’t split. Therefore, it would explode and turn into highly energetic particles. All hydrogen would do so simultaneously, so all the seas and all life and all clouds and all water which might be in other places would explode violently, causing a small-sized gamma ray burst. Most elements on the earth are lighter than iron, and therefore it would cost energy to split them. But since you said “simultaneously”, we’ll just have to violate Thermodynamics (and Special Relativity, for that matter). There would be a huge energy vacuum caused by the splices, which would probably suck in part of the hydrogen energy, and turn many of the split atoms back into their former selves. However, if you were thinking of a Death Ray which pumps into the atoms, splitting them apart, it wouldn’t violate thermodynamics, and there wouldn’t be an energy vacuum. In that case, the hydrogen would split as usual (causing a violent explosion), but the rest of the planet would just turn into whatever resu
