题目

（1）写出表示含有8个质子、10个中子、10个电子的离子的符号       。（写成ZAXn-的形式） （2）周期表中位于第8纵行的铁元素属于第         族。 （3）周期表中最活泼的非金属元素位于第         纵行         族。 答案：【答案】（1）818O2-；（2）Ⅷ；（3）18，ⅦA（每空1分） 【解析】 试题分析：（1）根据题意知，该微粒含有8个质子、10个中子、10个电子，则该微粒是带2个单位负电荷的质量数为18的氧离子；符号为818O2-；（2）由元素周期表的结构知，元素周期表的第8纵行的铁元素属于第VIII族；（3）周期表中最活泼的II. 完型填空。（15分，每小题1.5分） Life is not easy, but I’d like to say “When anything happens, believe in yourself.”When I was young, I was__________ nervous that I couldn’t talk to anyone. My classmates often laughed at me. I was __________ and couldn’t do anything. Later, one thing changed my life. My mother asked me to __________ an English speech contest (比赛). What a(n)__________ idea! It meant I had to speak in front of many teachers and students! “Come on, dear. Believe in yourself. You are sure to succeed(成功).” Then, mother and I __________ many different topics(话题). __________, I chose the topic “Believe in yourself”. I _____________ to remember the whole speech and practiced it over 100 times.__________my mother’s great love, I was successful. When I heard the news, I almost couldn’t believe my __________, when the news came that I had won the first place. I heard the cheers from the teachers and students. Some students looked down on (瞧不起) me before, but they all said “Congratulations!” to me. My mother cried excitedly and__________. Since then, when I do anything, I try to tell myself to be confident.1.A. so B. too C. very2.A. popular B. upset C. lively3.A. do well in B. take part in C. look forward to4.A. interesting B. good C. terrible5.A. talked to B. talked with C. talked about6.A. In a word B. In a hurry C. In the end7.A. tried my best B. cheered up C. went out8.A. With B. Under C. From9.A. ears B. nose C. eyes10.A. sadly B. happily C. angrily