元素的原子结构决定其性质和在周期表中的位置。下列说法正确的是 ( ) A. 元素原子的最外层电子数等于元素的最高化合价 B. 原子的最外层电子数相同的元素,一定属于同一族 C. 若 M + 和 R 2 - 的核外电子层结构相同,则原子序数: M>R D. 元素周期表中位于非金属分界线附近的元素属于过渡元素
【单选题】听力原文:M: Hi, Sally, going to the football game today? W. Not to it. I' m planning to watch it on television. M: Why is that? Do you feel too poor this close to the end of the month? W: Money is not the...
【单选题】听力原文:W: Look at this watch. It looks great, doesnt it? And its only $20. M: A $20 watch will break in no time. Besides, you already have a watch. Q: What does the man think the woman should do?1.