题干

元素的原子结构决定其性质和周期表中的位置.下列说法正确的是(   )

A:元素原子的最外层电子数等于元素的最高化合价

B:多电子原子中,在离核较近的区域内运动的电子的能量较高

C:P、S、Cl得电子能力和最高价氧化物对应水化物的酸性均依次增强

D:元素周期表中位于金属和非金属分界线附近的元素属于过渡元素

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答案(点此获取答案解析)

C

同类题5

根据短文内容,选择正确答案。

A

    Each New Year is a time for change and a fresh start, so many people like to make New Year's Resolutions(决心). A New Year's Resolution is a promise you make to yourself to do something good or to stop doing something bad in the New Year. Here are some teenagers' New Year's Resolutions for 2016.

    My New Year's Resolution is to get healthy. I'll stop drinking soda, and I'll eat more fruit at least an apple every day. I'll also do more exercise, such as playing basketball for half an hour every day.

Brandon   


    I want to get better grades in the New Year. To realize it, I will pay more attention in class, do homework on time and study hard. When I have difficulties with lessons, I'll ask others for help instead of giving it up.                                                                                                                                                       

Laura


    I would like to be nice to the people around me, and not get angry for every little thing that others say or do to me. When I do feel angry, I'll take a break and find good ways to deal with it like exercising, reading, writing, or talking with a friend or parent.                                                                                                                                         

Jack   


    I'll try to be more helpful to others. I will start with small things, like helping my parents clean the house and wash dishes after meals. I'd also like to volunteer in some places in my community.                                                                                                                                                

Erica