中学化学中考查的金属主要有钠、镁、铝、铁、铜,它们代表了主族元素的前三个周期金属元素与副族元素中用途最为广泛的过渡金属元素,其中有关钠单质的知识点多而细,其对应的化合物种类多且性质复杂,下面对钠的易错知识进行简单的小结归纳。一、钠单质1.钠与溶液反应时,往往是先 The metals examined in secondary chemistry mainly include sodium, magnesium, aluminum, iron and copper. They represent the most widely used transition metal elements in the first three cycles of the main group of elements. Among them, the knowledge about the elemental sodium More and more points, the corresponding variety of compounds and complex nature, the following error-prone knowledge of sodium for a brief summary. First, the sodium element 1 sodium and solution reaction, often the first