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元素推断题是高考中常见的题型之一,主要考查元素周期表和元素周期律以及物质结构的相关内容.解题的关键在于推导各种元素,然后再根据元素及其化合物的性质和元素周期律的知识进行答题.本文对该类试题中常见的描述性语言进行了解读(不包括稀有气体元素),供大家交流.一、核外电子排布的常见描述1.X原子最外层电子数是其周期数(电子层数)的n倍解读:周期序数=电子层数,最外层电子数=主族序数.假设周期序数为m,则最外层电子数为mn,并且满足mn<8(n=1时取2).如,最外层电子数是电子层数3倍的元素有:O;再如,
Elements of inference questions is one of the common questions in college entrance examination, the main examination of the periodic table of the elements and the periodic law of the elements and material structure of the relevant content. The key to solving the problem is to derive a variety of elements, and then according to the elements and their compounds Periodic law of the knowledge answer questions.This paper describes the common descriptive language in this type of test (not including rare gas elements) for your exchange.A common description of the nuclear electronic arrangement 1.X atomic outermost layer The number of electrons is n times the number of cycles (number of electrons): Periodic Number of Cycles = Number of Electrons and Number of Outermost Electrons = Number of Main Families Supposing the number of cycles is m, the number of the outermost electrons is mn, mn <8 (n = 1 when taking 2). For example, the outermost electron number is the electron layer 3 times the elements are: O; Another example,