Solid elements,coded as G,J and Q,belong to the same period of the periodic table,and form oxides with the following properties:
GO3 reacts with water to form a strongly acidic solution,
J2O3 reacts with strong acids and strong alkalis,
Q2O reacts with water to form a strongly alkaline solution.
(a)State which oxide would be described as amphoteric.(1 mark)
(b)State,giving reasons,which of G,J or Q is most electronegative.(2 mark)
(c)State,giving reasons,which oxide is molecular.(3 mark)
解答：G为S(硫)，J为Al(铝)，Q为Na(钠)。
（a）Al2O3为两性氧化物，既可与强酸反应，又可与强碱反应。
（b）一般来说，周期表从左到右，元素的电负性逐渐变大，而从上到下，元素的电负性则逐渐变小，所以电负性最大的是硫元素，其次是铝，最小的是钠。
（c）常温下SO3为气体，Al2O3为固体，Na2O为白色略黄状粉末，所以分子型氧化物是SO3。
备注：原来经历过的事情都不会忘记；说忘记的，是一时半会记不起罢了，但仔细去回想却还是能想起来的，比如曾学到的知识、遇过的人以及此时囊中羞涩，兜里没钱，穷到吃土。
