Final answer:
Hydrogen reacts explosively with oxygen, chlorine, and fluorine, forming water in a violent reaction with oxygen.
Step-by-step explanation:
Hydrogen reacts explosively with the elements oxygen, chlorine, and fluorine. When hydrogen reacts with oxygen, it forms water in a violent reaction, releasing a large amount of heat. The reaction can be represented by the chemical equation: 2H₂(g) + O₂(g) → 2H₂O(l) + 572 kJ.