题目

2019年是元素周期律发现150周年。如图是氯元素在元素周期表中的相关信息，下列说法错误的是（ ）A. 氯属于金属元素B. 氯的原子序数是17C. 氯原子核外有17个电子D. 氯的相对原子质量是35.45 答案：【答案】A【解析】A、根据元素周期表中的一格可知，中间的汉字表示元素名称，该元素的名称是氯，带“气”字旁，属于非金属元素，故A错误。B、根据元素周期表中的一格可知，左上角的数字为17，该元素的原子序数为17，故B正确。C、根据元素周期表中的一格可知，左上角的数字为17，表示原子序数用所给动词的适当形式填空。 1. The teacher is             (count) the books now. 2. Don't close the door.             (open) the door, please. 3. The boy isn't standing in a boat. He is             (sit) in a boat. 4. The students are not talking, they             (write). 5. Edith             (have) many things to do after class. 6. John often             (help) his friends with their English.7. Mike             (go) to the park with his parents and sister on Saturday. 8. — Are you listening to me, Joy? —Sorry, I             . (think) 9. Lin Tao is in the tree. He can't             (get) down. 10. My mother             (make) cakes every Friday. It is Friday today.