2023英语周报一初12期答案

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20.(14分)(1)1分)球形(1分)(2)小于(1分)Zn原子半径小,且价电子排布为全满结构,第一电离能更大(1分)(3)平面三角形(1分)(4)F>N>H(1分)sp3(1分)HF分子间能形成氢键(1分)(5)①1:1(2分)②2.06×19(2分,其他合理答案也给分)③(0,,)(2分)【解析】(1)基态F原子的价电子排布式为2s2p3,2其轨道表达式为回基态Zn原子的价电子排布式为3d04s2,占据最高能层电子的电子云轮廓图形状为球形。(2)K与Zn属于同一周期,Zn原子半径小,且价电子排布式为3d04s2的全满结构,故K的第一电离能小于Zn的第一电离能(3)CO中C原子的价层电子对数为3,孤电子对数为0,其立体构型为平面三角形(4)元素的非金属性越强,电负性越大,故NHHF2的组成元素的电负性由大到小的顺序为F>N>H;其中N原子的价层电子对数为4,杂化方式为sp2;HF分子间能形成氢键故能形成分子缔合体(HF)(5)①由图可知,ZnF2中Zn的配位数为6, KZnF3中Zn的配位数为6,二者之比为1:1②每个ZnF2晶胞中含有2个Zn2和4个F-,ZnF2晶体的密度为103×2gNA·(a×10-cm)2×(c×10-cm)2.06×102Na2g·cm-s③由晶胞结构图知,D点原子处于面心位置,D的原子坐标参数为(0,2·2)

第三节One possible versionParagraph 1Finally, afler struggling for a minute or tuo, I still gotpulled underwater. I told myself I should never give upThen I pulled the weed again with great efforts. The weedfinally broke. I swam back to the surface to take a debreath. I saw two young men in canoes, racing each other.I was exhausted and shouted for help. The two men saw meand raced towards me. By the time they reached me, I hadbeen already unconsciousParagraph 2When woke up, I was in an empty room lying on abed. It was not until a doctor came into the room that I realized that I was in a hospital. Jimmy and Bobby told me thetwo young men brought me to the shore and sent me to thehospital. After a few minutes, my parents with half angryand half worried faces walked in. My parents scolded me ifor running out of the house secretly but were also glad thatI was not seriously injured. I will never forget that terrifyingexperience. Neither will I ever want to show off again

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