燃烧规律——凡是除了活泼的F、Cl、Br、I、O、N这六种活泼非金属元素的单质及其负价元素的中心元素为最高价时的化合物(NH3例外)不能燃烧外,其它非惰性的非金属元素的单质及其负价元素的化合物都能燃烧,且负价元素的化合物燃烧火焰的颜色与对应单质燃烧火焰的颜色相同或相似。如:单质硫能燃烧,负价硫元素的化合物Fes、FeS_2、Na_2S、 Burning Law - In addition to lively F, Cl, Br, I, O, N elements of these six kinds of lively non-metallic elements and the negative element of the central element of the highest price of the compound (except NH3) can not be burned, Other non-noble non-metallic elements and their negative elemental compounds can burn, and the negative elements of the compound burning flame color and the corresponding single-color combustion flame the same or similar color. Such as: elemental sulfur combustion, the negative elemental sulfur compounds Fes, FeS_2, Na_2S,