从元素周期表中可以查到组成氯化钠的两种元素的信息，下列对其认_爱下问搜题

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问题多选题

从元素周期表中可以查到组成氯化钠的两种元素的信息，下列对其认识正确的是（　　）

A．氯化钠的相对分子质量是28

B．氯、钠两元素的本质不同在于质子数不同

C．氯、钠两元素原子的最外层电子数之和为28

D．氯、钠两元素的原子结构示意图分别为

和

答案

BD

补全对话，情景问答

补全对话。

A. That's great!
B. No, I haven't.
C. Yes, I have.
D. I hope you'll like the city.
E. And I've been dreaming of visiting it for a long time.
F. I have no time to visit Beijing.
G. By the way, what's the weather like during this time of the year?

M: Linda, I don't think you've been here before, have you?
W: 1______ I've traveled to many other places in China. But this is my first time to come to Beijing.
M: 2______
W: I'm sure I'll like it. I've heard about the Great Wall. 3______ So I can hardly believe that my
dream has come true.
M: I'll be glad to take you to go sightseeing.
W: 4______Thank you very much.
M: It's my pleasure.
W: 5______
M: It's usually warm and sunny. And it seldom rains.
W: So I've come at the right time.
M: I think you have.

问答题简答题

端午节是哪个民族的传统节日之一？