书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!
3e18.(1)/(1分):c:(1分)(2)AC(1分)(3)(2->Na >A13*(1分)(4)GaO2 CO2 2H2O=Ga(OH)3↓ HCO[或2Ga02 CO, 3H20 2Ga(OH), C0]-]19.(1(2分)5)①CD(1分)②GaO: 3e- 2H:04OH(2分)(6)GaCl, NH,一定条件下GaN 3HC1(2分)【解析】(1)元素Ga位于Al的下一周期,则位于第四周期第ⅢA族,其核外电子数为13 18=31.所以Ga原子结构示意图为//,co2的电子式为9(2)在 NaAlc2和 NaGa2溶液中通人适量CO2后生成AI(OH),并未生成Ga(OH)3,根据强酸制弱酸的址C。(H),>A(OH)3,A错误;因是智商低,只是对这个世界有点不(2)在 NaAlC2和 NaGao2溶液中通人适量CO2后生成Al(OH)3,并未生成Ga(OH)3,根据强酸制弱酸的原理可知,酸性Ga(OH)3>Al(OH)3,A错误;因Al2O3可与盐酸反应生成ACl3,两者同族,性质相似,所以Ga2O3可与盐酸反应生成GaCl2,B正确;A(OH)3不可以由A2O3与水反应得到,根据元素的相似性可知,Ga(OH)3也不可由GaO2与水反应得到,C错误;同主族元素,其金属性依次增强,所以与酸反应的剧烈程度依次增大,即Al
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