问题
多选题
下列化学用语，不能表示氯离子的是（ ）
A．Cl-
B．
Cl 3717
C．
D．1s22s22p63s23p6
| 3717Cl |
答案
A．根据离子的表示方法：在表示该离子的元素符号右上角，标出该离子所带的正负电荷数，数字在前，正负符号在后，带1个电荷时，1要省略，因此氯离子表示为：Cl-，故A正确；
B．
Cl表示质子数为17，中子数为37的氯原子，故B错误； 3717
C．
核内质子数为17，核外电子数为18，是氯离子，故C正确；
D．1s22s22p63s23p6核内质子数为17，核外电子数为18，是氯离子，故D正确．
E．
Cl表示质子数为17，中子数为37的氯原子，故E错误； 3717
故选BE．
填空题
| 从方框中选择合适的短语并用其正确形式完成句子。 | |
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| 1. I do my homework _____ 8:00 am _____10: 00 am in the summer holiday. 2. The park is _____ the bank _____ the fruit shop. | |
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| 3. I am sorry to bring you _____ trouble. 4. There are _____ animals in the zoo. | |
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| 5. The cake is delicious, so I eat 6. The car is _____ expensive. I can't buy it. 7. You bought _____ apples for yourself. | |
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| 8. — Can you help me look afterthe baby? — _____. 9. — I am sorry I am late. — _____. Come early next time! | |
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| 10. Take care and _____ you. 11. Pop songs and rock songs are written _____. 12. — When do you usually get home? — I usually get home at 8 o'clock _____. 13. Susan is a clever girl. We _____ her. 14. My father does _____ work in that company _____. 15. Let's stay _____ days longer. |