2 ms·It's produced from mercuryby modeless 1y agoIt's produced from mercuryMrLeap 1y agoRight, fusion stops being a net producer of energy on atoms heavier than iron. A star’s fusion reaction ceases when too much of its core turns to iron.modeless 1y agoMercury is heavier than gold so it's a fission reaction.MrLeap 1y agoAh yeah, that slid by me.