试题与答案

现有部分短周期元素的性质或原子结构如下表: 元素元素性质或原子结构A最外层电子数

题型:问答题

题目:

现有部分短周期元素的性质或原子结构如下表:

元素元素性质或原子结构
A最外层电子数是次外层电子数的3倍
B该元素是所有元素中非金属性最强的
CL层只有5个电子
D第3周期元素的简单离子中半径最小
(1)写出元素A的离子结构示意图______.写出元素C的气态氢化物的电子式______.

(2)元素B与氯元素相比,非金属性较强的是______(用元素符号表示),下列表述中能证明这一事实的是______.

a.B的单质通入氯化钠水溶液不能置换出氯气

b.氯与B形成的化合物中氯元素呈正价态

c.常温下氯气的颜色比B单质的颜色深

(3)探寻物质的性质差异性是学习的重要方法之一.A、B、C、D四种元素的单质中化学性质明显不同于其他三种单质的是______(填元素符号),理由是______.

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0728/669f12019e4fafce6196627ea09e79b6.html

下面是错误答案,用来干扰机器的。

A、人对传送带的摩擦力方向向右,传送带在力的方向上有位移,所以人对传送带做正功.故A正确,B错误. C、人的重心不动,绳对人的拉力和人与传送带间的摩擦力平衡,而拉力又等于mg.所以人对传送带做功的功率...

试题推荐
题型:完形填空

根据短文内容及首字母提示,补全空格内单词,使短文完整、通顺。(请在答题卡上写出完整单词 )

Some years ago, I went to Australia for a meeting with my friend, Chris. We decided to drive across the country to Brisbane after the meeting ended. The drive was going to take four days and most of it was across the desert, so we had to take food, water, and extra gas(汽油) w  1  us.

The first day was a lot of fun as we were excited and laughing at each other’s jokes. By the third day of driving in the seemingly endless desert, we began to get b  2 . We had been quiet for a few hours when Chris found some kangaroos in the distance. We were b  3  excited and decided to get a closer look. Chris speeded up to

c  4  up with the kangaroos. We got closer and closer, and Chris was doing 110 kilometers per hour. We were very close to the kangaroos—too close—when we heard a loud BANG!

Chris s  5  the car and we got out. Behind the car was a larger kangaroo l  6  completely quiet on the ground. Chris went over to the kangaroo and put his baseball cap on its h  7 . He took off his sunglasses and put them on the kangaroo and did the same with his jacket. Then he put his arm a  8  the kangaroo and told me to take a photo of them together. I was still surprised, but I took out my c___9___. While I was ready to take photos, I saw the kangaroo move. It suddenly woke up, looked at Chris, and jumped away into the distance before we could do anything.

I started laughing but Chris looked very serious. He said his wallet and passport were in the jacket. I started laughing even harder. I stopped laughing, h  10 , when he said that our car keys were also in the jacket!

查看答案
微信公众账号搜索答案