陈老师刚刚结束了元素内容的教学,但张同学仍对一些问题疑惑不解,因此他到陈老师办公室去问陈老师郾张:如何理解元素概念中“一类”两字的含义?师:初中化学教材对元素的概念是这样叙述的:“元素是具有相同核电荷数(即核内质子数)的一类原子的总称”.概念中的“一类”两字是指核 Teacher Chen has just finished the teaching of the elemental content, but Zhang is still puzzled by some questions, so he went to Mrs. Chen’s office and asked Mr. Chen how to understand the meaning of the word “a class” in the concept of elements. The concept of elements in junior high school chemistry textbooks is described as follows: “Elements are a generic term for a class of atoms that have the same nuclear charge number (ie, the number of protons in the core). The word “a type” in the concept refers to the core