化学—物质结构与性质](1分);3:2(2分)2)①正四面体②sp2;sp3③N(或氮)(各1分)(3)O>N>S>H;16NA(或9.632×1024)(各2分)(4)①B。×100(各2分)解析:(1)基态Cr原子的价电子排布图(轨道表达式)为111+1团2)①阴离子CO4的空间构型为正四面体②C1和C2的杂化类型分别为3)Ni(NH3)4SO4中所含非金属元素的电负性由大到小的顺序为O>N>S>H;1 mol [Ni(NH含有的a键数目为16NA(或9.632×1024)(4)②每个晶胞中含有2个Mo原子,晶胞体积V2cm,则立方边长cm,最近两原子相距sa,根据比例关系,原子核最近真实距离等于/2M×2×109m

One possible version:A Meaningful CleanupIn order to encourage us students to participate in volunteer activities and prevent virus spreading, our classorganized a meaningful cleanup in a nearby community last Sunday morning.We gathered on the playground and then we walked in a line to the community. Under the guidance of ourteachers, we were divided into two groups. Students in Group One did some cleaning, like sweeping floors andmopping stairs. Meanwhile, students in Group Two disinfected the buildings. With everyones efforts, we fin-ished the task successfullyIve benefited a lot from the activity. It makes me learn teamwork and I ve realized community health is cru-cial and that I can also do something worthwhile for our community.

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