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化学与数学存在着千丝万缕的联系,下面就从数字的奇偶性方面来说一说化学知识的一些规律,同时介绍几种常见习题的解题捷径。例1如图1所示的为周期表中的一部分,图中数字为原子序数,其中M为37的是()。思路分析:本题考查的是元素周期表中位置相邻的元素的原子序数之间的关系。这就要求我们熟悉周期表的编排原则及各周期元素的种类数。同周期元素的原子序数从左到右依次增大,各周期元素种类数依次为:2、8、8、18、18、32,第七周期没排满(教材附录选用的周期表排到112号元素,即第七周
There are inextricable links between chemistry and mathematics. The following is a discussion of the laws of chemistry from the aspect of the parity of numbers, and introduces short cuts for solving common problems. Example 1 is a part of the periodic table as shown in Fig. 1. The numbers in the figure are atomic numbers, where M is 37 (). Analysis of the idea: This question examines the relationship between the atomic numbers of elements that are adjacent to each other in the periodic table of elements. This requires us to be familiar with the scheduling principles of the periodic table and the number of types of elements in each cycle. The atomic number of elements in the same cycle increases from left to right. The number of elements in each cycle is: 2, 8, 8, 18, 18, and 32. The seventh cycle is not full. Element, the seventh week