user-avatar
luyennguvan912
2 năm trước
Một nguyên tử của nguyên tố x có tổng số hạt là 58. Biết rằng tổng số hạt mang điện nhiều hơn số hạt ko mang điện 18. Tìm nguyên tố x
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Ex5. Rewrite these sentences begin with the words given so that they have the same meaning as the first ones. 1. My mother gave me a very nice watch yesterday. A. I was gave a very nice watch yesterday. B. I was give a very nice watch yesterday. C. I was given a very nice watch by my mother yesterday. D. I was give a very nice watch by my mother yesterday. 2. What a thick book! A. How thick the book is! B. How the book thick is! C. How the book thick! D. How thick book is! 3. Although he took a taxi, Peter arrived late for the concert. A. In spite of taking a taxi, Peter arrived late for the concert. B. In spite of taking a taxi, Peter arrives late for the concert. C. In spite taking a taxi, Peter arrived late for the concert. D. In spite of took a taxi, Peter arrived late for the concert. 4. I met Frank three years ago and we are still friends. A. Frank and I have been friends three years ago. B. Frank and I are friends three years ago. C. Frank and I have been friends for three years. D. Frank and I had been friends three years ago. 5. The garden party won’t take place here if the weather doesn’t improve. A. If the weather improves, the garden party won’t take place here. B. If the weather improves, the garden party will take place here. C. If the weather doesn’t improve, the garden party willt take place here. D. If the weather not improves, the garden party won’t take place here. 6. Do you have a cheaper computer than this?  Is this___________? A. the cheapest computer B. the cheapest computer you have C. the cheaper computer you have D. as cheap as computer 7. They had these men paint their house last month.  They had ___________ A. their house paint last month. B. their house painted last month. C. their house paint last monthby these men D. their house paints last month. 8. I haven’t eaten this kind of food before.  This is the first time ___________ A. I haven’t eaten this kind of food. B. I eat this kind of food. C. I haven’t eat this kind of food. D. I have eaten this kind of food. 9. I'll call the police if you don't___________ A. leave me alone. B. live me alone. C. left me alone. D. leaved me alone. 10. Jill drives more carefully than Jack does.  Jack drives ___________ A. less carefully than Jill is. B. less carefully than Jill does. C. less careful than Jill does. D. more carefully than Jill does. 11. We will use renewable energy in the future. A. Renewable energy will use in the future B. Renewable energy will be use in the future C. Renewable energy will be used in the future 12. Although they are short, they still love playing sports. A. In spite of they are short, they still love playing sports B. In spite of being short, they still love playing sports. C. Despite they are short, they still love playing sports 13. A group of foreigners visited the slums last week, didn’t they? A. A group of foreigners visit the slums last week, didn’t they? B. Did a group of foreigners visit the slums last week? C. A group of foreigners visit the slums last week? 14. This is our school. A. This school is mine B. This school is our C. This school is ours 15. Let’s go to the school cafeteria. A. We suggest to go to the school cafeteria. B. How about going to the school cafeteria? C. Why don’t we going to the school cafeteria? 16. What is the distance between Ha Noi and Vinh? A. How long is it from Ha Noi to Vinh? B. How is it from Ha Noi to Vinh? C. How far is it from Ha Noi to Vinh? 17. They will use solar energy to protect the environment. A. Solar energy will used to protect the environment. B. Solar energy will be used to protect the environment. C. Solar energy will using to protect the environment. 18. I find English interesting. A. I am interested in English. B.I find interesting English. C.I find English interested.

Điền những từ sau vào đoạn văn : hug ; pedal ; lift ; old-fashioned ; skyscraper ; backwards ; forward ; polluted ; virtual ; workshop I love playing computer games , especially (1)... virtual.. ones , which are so realistic . I've got a new time-travel game . If you click the button to go (2)............... into the future , you can see very fall (3).................. . On the screen ,you can (4)...............people into the air to the top of these buildings and see inside .If you click the button to go (5)................. , you can see the past. It's fun to see how people travelled over 100 years ago . There weren't many cars so the air wasn't (6)............... . In the game there's an (7)...........car in a (8).............for repair. It doesn't go very fast! People (9)............ their bicycles along the street . You can make friends and (10)............the people you like. You can follow them around to see their daily life . You can follow them around to see their daily life , which is fun!

1. _______ we go to the beach if it were cloudy? a. Do b. Would c. Will d. Can 2. It’s Monday today, but if it _______ Sunday, I _______ to the beach. a. were - would go b. is - can go c. is - could go d. was - will go 3. Bernard _______ late for school if he _______ the bus. a. wouldn’t be — missed b. won’t be - misses c. will be — misses d. would be — didn’t miss 4. If I were you, I _______ listen to your parents. a. should b. must c. have to d. would 5. I don’t know her phone number. _______ her if I knew it. a. I’d call b. I’ll call c. I call d. I won’t call 6. If it _______ tomorrow, we _______ have to water the plants. a. rained - would b. will rain - wouldn’t c. rains — won’t d. didn’t rain — will 7. She could enter university if _______ it. a. she passes b. she’d pass c. would pass d. she passed 8. I _______ be able to sleep if I hear engine noise. a. will b. won’t c. can d. mightn’t 9. Huong will do the exercises again if she _______ a lot of mistakes. a. made b. make c. makes d. will make 10. I wouldn’t go there if I _______ you. a. were b. am c. be d. was

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team