题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Why Is Sorting Important When Recycling? We all agree that we should recycle more athome, in the office or when out and about. Consequently, they can be collected and taken to the right placefor recycling. This is what the process of sorting allows us to do. And the effective sortingneeds to happen first, in our own home and second, in sorting plants to whichwaste is collected. When you put a plastic bottle in the right recycling bag orbin, you are helping sort recyclablesA、B、C、D、E代表5种元素。请填空：（1）A元素基态原子的最外层有3个未成对电子，次外层有2个电子，其元素符号为  ；          （2）B元素的负一价离子的电子层结构都与氩相同，B的原子结构示意图为                   （3）C元素是第三周期中无未成对电子的主族元素，它的轨道排布式为             ；  （4）D元素基态原子的M层全充满，N层只有一个未成对电子，D基态原子的电子排布式为                     （5）E原子共有3个价电子，其中一个价电子位于第三能层d轨道，指出该元素在周期表中所处的周期数和族序数