- The metals which are at the bottom of activity series are very low reactivity and do not bum or oxidase even on surface. Ex : Ag, Pt, Au.
- The metals like Pb, Cu and Hg do not burn but only form a surface layer of oxide i.e., PbO, CuO, HgO.
- The metals like Al, Zn, Fe react with oxygen to form respective oxides.
- The metals like Ca and Mg bum with decreasing vigorousity to form oxides.
- The metals like K, Na bum vigorously limited supply of oxygen but form peroxides in excess of oxygen