英语周报2022-2022七年级28答案

I looked at what the second man had dropped; it was jewellery. It all happened too quickly,but I soon realized what had happened. They were burglars. My friend Jeremy, who was waitingfor me, quickly ran out. when hearing unusual noises. We called the police and they were there 5minutes later. I gave the police officer descriptions of the thieves and told them the names theyhad called outYou were brave for trying stop them, "said the officer: We should be able to catch themwith your information. " Jeremy told the officer the owners of the house were on holiday and gavehim a phone number. When the officer left, I told Jeremy about the mistake with the doornumbers. I hadn, t really been brave at all, but my mix-up had stopped the burglars getting awaywith the jewelry. Jeremy's neighbor thanked me a lot when they came back. Actually I have been

20.(12分)(1)1s2s2p3s23p2(或[Ne]3s23p2)(1分)纺锤形(或哑铃形)(1分)镁原子的3s轨道为全充满状态,3p轨道为全空状态,稳定性较强,故基态铝原子的第一电离能小于基态镁原子(2分)(2)氯化铝是分子晶体,熔融状态下不能导电(2分)(3)AD(2分)(4)Fe3+的价电子排布式为3d5,处于半充满状态,结构稳定(2分)(5)>S>C(2分)【解析】(1)基态铝原子的核外电子排布式为s22p°3s23p2或[Ne]3s23p2;p轨道电子的电子云轮廓图形状为纺锤形或哑铃形;镁原子的3s轨道为全充满状态,3p轨道为全空状态,稳定性较强,故基态铝原子的第一电离能小于基态镁原子。(2)氯化铝是分子晶体,熔融状态下不能导电,工业上不能用电解熔融氯化铝的方法获取铝单质。(3)基态Fe2+的核外电子排布式为1s22s2p53s23p53d°,A项正确;铁元素位于第四周期第Ⅷ族,B项错误;每种元素都有特征谱线,铁丝可用于焰色反应中蘸取待测物,是因为铁的原子光谱不在可见光区域,C项错误;CO整体显0价,根据化合物中各元素化合价代数和为0可知,Fe的化合价为0,D项正确。(4)Fe3+的价电子排布式为3d5,处于半充满状态,结构稳定,而Fe2的价电子排布式为3d6,故Fe3+比Fe2+稳定(5)非金属性:N>S>C,故电负性:N>S>C。

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