反はん応のう性せいはんのうせいMeanings1nounreactivitychemistryChemistry term referring to the tendency of a substance to undergo chemical reactions.この金きん属ぞくは反はん応のう性せいが高たかいため、空くう気き中ちゅうですぐに酸さん化かする。This metal has high reactivity, so it oxidizes quickly in air.
