* Alkali metals (Group 1): Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr) all react explosively with oxygen, especially in the presence of water.
* Alkaline earth metals (Group 2): Calcium (Ca), Strontium (Sr), and Barium (Ba) also react vigorously with oxygen, though often not quite as explosively as the alkali metals.
* Phosphorus (P): White phosphorus ignites spontaneously in air, reacting with oxygen to produce phosphorus pentoxide.
* Certain transition metals: Fine powders of metals like titanium (Ti), zirconium (Zr), and hafnium (Hf) can react explosively with oxygen when exposed to a spark or flame.
Important Note: The degree of reactivity depends on several factors, including the surface area of the element, the temperature, and the presence of other substances.
