八年级上册英语周报（2022-2022）答案

第四部分写作第一节Dear Jack,Welcome to our school to study as an exchange studentAs for how to borrow books from the school libraryyou need to have your student ID card and present it to thelibrarian, who can register for you. Then you can go to thebookshelves to look for what you need. You can borrow 2books once and keep them for a week in order that you canhave enough time to finish reading them. If you haventread the book through, you can renew it. You' ll have topay for it if you get the book damaged or lost.hope all this can be of help to you. For morenformation, don,t hesitate to ask meLi Hua

8.(11分)(1)4s24p3(2分)(2)C>S>As(2分)(3)C>P>S(2分)(4)A(2分)(5)氧的电负性大且原子半径小,H2O分子间及与H可形成氢键,而硫的电负性较小且原子丧径大几乎不能形成氢键(3分)【解析】(1)基态As原子的价电子排布式为4se(2)电负性:C>S>As。(3)第一电离能:Cl>P>S。(4)A项表示氮原子的最低能量状态;B、C项2p轨道的3个电子排布违背洪特规则;D项表示B原子的基态核外电子排布。故选A项。(5)氧的电负性大且原子半径小,H2O分子间及与H可形成氢键,而硫的电负性较小且原子半径大,几乎不能形成氢键,故H2O可以形成HO:或H;O+,而H2S几乎不能形成类似的Hs或H3S+。

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