问题
选择题
在主族元素X、Y、Z中，X与Y两元素的原子核外电子层数相同，X的原子半径大于Y的原子半径，X与Z两种原子的阳离子具有相同的电子层结构，Z的离子半径大于X的离子半径，则X、Y、Z三种元素的原子序数最大的是 [ ]
A. X
B. Y
C. Z
D. 无法判断
答案
答案：B
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在主族元素X、Y、Z中，X与Y两元素的原子核外电子层数相同，X的原子半径大于Y的原子半径，X与Z两种原子的阳离子具有相同的电子层结构，Z的离子半径大于X的离子半径，则X、Y、Z三种元素的原子序数最大的是 [ ]
A. X
B. Y
C. Z
D. 无法判断
答案：B
| 情景交际。 | |
| A: Look! What's that? B: Sorry, I don't know. Let's ask Han Mei. A: 1______ C: It's a cup. A: A cup? It's very strange. I've never seen a cup with three legs. C: Yeah. It was used in the old days. A: 2______ C: It was used for drinking wine. A: 3______ C: It was made of metal. B: Hmm. It's interesting, isn't it? A: Yeah. Look! There's a teapot in a bowl. B: 4______ C: That's not a teapot. It was used for serving wine. The big bowl was used for keeping the wine warm. B: 5______ C: When the bowl was filled with hot water, the wine would get warm. A: That's a good idea. Thank you, Han Mei. I've learnt a lot about old Chinese inventions today. C: Me too. | |
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