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“短板”梳理《选修3——物质结构与性质》在高考中作为三道选考试题之一,分值15分,因其省时、易得分的特点越来越被考生和教师所重视。从连续几年的高考试题来看,近几年的试题难度与模式基本固定,这也是备受关注的原因。试题模式基本固定1.以原子结构特征作为出发点,推断元素。根据所推断的元素书写元素的原子、离子的基态电子排布式、价电子排布式或价电子排布图等。2.比较元素第一电离能、电负性大小
“Short board ” combing “Elective 3 - material structure and nature” as one of the three entrance exam questions in the college entrance examination, score 15 points, because of their time-saving features easy to score more and more candidates and teachers Attention. Judging from the college entrance examination papers for several years in a row, the difficulty and mode of examination papers in recent years have basically been fixed, which is also a cause of great concern. Test mode is basically fixed 1. The atomic structure as a starting point, inferred elements. According to the inferred elements of the atomic elements written, the ground state electronic arrangement of ions, valence electron layout or valence electron mapping and so on. 2. The first element of ionization energy, the size of electronegativity