题干

人教版九年级化学上册教材图3﹣12部分原子的结构示意图如下:

请回答:

(1)氧元素与硫元素化学性质相似的原因是____;

(2)写出11号和17号元素组成化合物的化学式____ ;

(3)同一周期(横行)的原子结构示意图具有共同的特点是____(任写一点).


上一题 下一题 0.0难度 选择题 更新时间:2013-04-27 03:43:33

答案(点此获取答案解析)

两种原子的最外层电子数相同,NaCl,电子层数相同

同类题5

通读下面短文,掌握其大意,然后在各题所给的四个选项(A、B、C和D)中选出一个最佳选项。

     In New York City public schools, 176 different languages are1 among more than one million students.

     For 160,000 children, English is not their first language. New York's Department of Education 2 learning better for these students by providing dual-language programs. Students are usually taught3 two languages, English and 4, like Chinese or 5. Math, social studies, science and all other 6courses are taught in both languages. And they7the culture of the other country at the same time.

      Milady Baez is Deputy Chancellor of English Language Learners. She says these dual-language programs will help children 8 in the future. "The jobs of the future 9that our students know more than one language. They are going to be traveling 10. They are going to be communicating with people from all over the world. This will open doors for them."

      Shuya Zhang teaches a dual language class. She says the program helps children get ready 11work with people in other countries.   "Nowadays, America has started economic relationships with China. Lots of factories 12. They need people who 13 both practical skills and language skill."

     14these dual-language programs are popular, some groups in the U.S. think English should always comes first. "We have no problem with people speaking multiple (多种多样的) languages. It’s OK if people want to speak15different language at home. What we do think is schools should prioritize English."