在新教材高一第一章元素周期律的教学中 ,善思的学生常常会有这样的疑问 :随着同周期元素原子序数的递增 ,元素的非金属性逐渐增强 ,其最高价氧化物对应的水化物的酸性逐渐增强。为什么要加限制条件“最高价” ?如何理解亚硫酸、次氯酸等为弱酸 ?又如何解释元素非金属性的强弱 In the teaching of the elemental periodic law in the first chapter of the first year of the new textbook, students of good thinking often have such questions: as the atomic number of the same period element increases, the non-metallicity of the element gradually increases, and its highest oxide counterpart The acidity of the hydrate gradually increases. Why do we have to impose the “highest price” on the limiting conditions? How do we understand that sulfite and hypochlorous acid are weak acids? How do we explain the strength of non-metallic elements?