问题 填空题

(4分)图6是钾元素在元素周期表中的信息示意图和它的不完整的原子结构示意图,请根据图中给予的信息回答:

(1)钾原子核中质子数是        

(2)钾原子中最外层电子数是      ,钾原子在化学反应中易         (填“得”或“失”)电子,形成     (填离子符号)。

答案

(4分)(1)19;                                             (1分)

(2)1;失;K+                                        (每空各1分)

本题主要考查了原子结构方面的内容,在原子中,核电荷数=核内质子数=核外电子数=原子序数,核外电子是分层排布的,元素的化学性质与最外层电子数有关。

(1)由图中可知,钾的原子核中含有19个质子;

(2)由图中可知,钾原子中最外层电子数是1,在反应中容易失去,变成带一个单位正电荷的钾离子(K+);

写作题
书面表达。
     根据中文提示和英文书信内容,写一封意思连贯、符合逻辑、不少于60词的回信,信的开头和结尾已给出,其字数不计入所完成的回信中。请不要写出你的校名和姓名。
     假设你叫张华,是美国中学生Simon的笔友,你收到了他的来信。请给西蒙写一封回信。针对她的问题,谈谈你的看法,同时提出一些帮助他解决问题的建议。 
 
Dear Zhang Hua,
     My name is Simon and I am a Grade 9 student. I am crazy about football! I have plenty of friends,
and we always play football together at school or in the park after school. We like staying out late to
play football. We often play for three hours or more and forget when to stop. Then I get into trouble
at home because my parents do not allow me to play outside after 6 p.m. What should I do?
Best wishes
                                                                                                                                Simon

Dear Simon,
      Thank you for your letter. I hope I can offer you some useful advice.
______________________________________________________________________________
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I hope my answers will be of some value to you.
Best wishes
                                                                                                                        Zhang Hua
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