题干

元素周期表中,同周期元素的结构和性质呈现一定的规律性变化.下表列出的是第三周期元素的原子半径及主要化合价(部分信息未列出).下列有关说法不正确的是(    )

元素

Na

Mg

Si

P

Cl

原子的最外层电子数

1

2

3

4

5

6

7

原子半径(1010m)

1.86

1.60

1.43

1.10

1.02

0.994

最高正价

最低负价

+1

+2

+4

﹣4

+5

﹣3

+7

﹣1

A:⑤处的最高正价是+6,最低负价是﹣2

B:③处的数值介于1.10﹣1.43之间

C:第三周期元素(Na﹣Cl)的最高正价数等于其原子的最外层电子数

D:元素①的原子序数是13,①和②形成的化合物的化学式为AlS

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答案(点此获取答案解析)

D

同类题5

阅读下列短文,从每题所给的四个选项 (A 、B 、C  和 D )中 ,选出最佳选项。

Anne LaBastille was born in New York City and grew up in New Jersey. Her first experience with the wilderness was in the Adirondacks in the northeast of New York, where she worked at a summer resort (度假胜地) to earn money for college tuition (学费) by caring for the horses, giving riding lessons, and working as a waitress. And she had many chances to begin her adventure in the Adirondack wilderness.

Anne returned to school in the fall, but she continued to spend as much time as she could in the Adirondacks. She grew to love her time alone in the mountains. Anne graduated from college with a bachelor's degree in conservation of natural resources (资源) and began working for the National Audubon Society in Florida as a wildlife tour leader.

Although Anne took great pleasure in showing people the animals living in t he Florida Keys and the Everglades National Park, she longed for the mountains in the northern parts of New York. Finally she decided to build a cabin near Black Bear Lake. Over the years, however, more and more tourists began hiking near her cabin. As a result, Anne decided to build another cabin deeper in the woods at Lily Pad Lake.

    Anne lived in the woods for most of her life. She enjoyed living alone in the woods, and her life was far too busy for her to be lonely. When she was not writing books, she wrote articles for National Geographic, Reader's Digest, and other magazines. In her later years, Anne conducted research in Guatemala on an endangered bird called the grebe. She also lectured nationwide about ecology. Besides, Anne worked with a number of organizations dedicated to (致力于) conservation.

    As a respected guide, author, and conservationist, Anne not only loved the land but also had found a way to become part of it.