X、Y、Z、W是原子序数依次增大的不同主族短周期元素，其中两种为金属元素，X原子的最外层电子数与次外层电子数相等，X与W、Y与Z这两对原子的最外层电子数之和均为9．下列说法正确的是

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X、Y、Z、W是原子序数依次增大的不同主族短周期元素，其中两种为金属元素，X原子的最外层电子数与次外层电子数相等，X与W、Y与Z这两对原子的最外层电子数之和均为9．下列说法正确的是（）

A：Y的简单离子半径大于W的简单离子半径

B：Z的氧化物对应水化物为强酸

C：固体Y₂Z₃不能从溶液中制得

D：XW₂分子中各原子最外层都达到8电子稳定结构

上一题下一题 0.0难度选择题更新时间:2018-01-22 08:11:02

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C

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从下面方框中选择正确的单词并用其适当形式填空，使短文意思完整、通顺。

come, for, good, daughter, one, have, June, banana, when, we

Dear Jenny,

My name is Alan. I'm a 12-year- old girl. I'm the only ____ in my family. My birthday is on ____ 1st. It's the ____ day of the sixth month. It's also the Children's Day(儿童节). My parents ____ a party for me on that day. My friends ____ to the party. They bring(带来) me many birthday presents(礼物), and they sing Happy Birthday to me. ____ eat some strawberries, oranges and ____. We eat chicken and cakes ____ dinner. We also play games. We have a ____ time! How old are you? ____ is your birthday? Can you tell me?

Alan

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