Câu 13: Cation R+ có cấu hình electron ở lớp ngoài cùng là 3p6. a) Viết cấu hình electron nguyên tử của nguyên tố R. b) Xác định vị trí của nguyên tố R trong bảng tuần hoàn. c) Tính chất hóa học đặc trưng nhất của R là gì ? Lấy 2 phản ứng để minh họa. d) Anion X– có cấu hìh electron giống cấu hình electron của cation R+. Hãy cho biết tên và viết cấu hình electron nguyên tử của nguyên tố X.

làm hộ nhé .................... 2 bài

That is our class this woman is my teacher he isn't a doctor she is my friend that book is new i'm a nurse is this man tall? các câu sau chuyển sang số nhiều là gì ?

Read the following passage and choose the correct answer for each question below. Scientists believe that the smart home may be the home of the future. These homes may be of different shapes and sizes. They may also float on the water. Scientists have designed the eco houseboat – a kind of house floating on the sea. But the houseboat is stable and doesn’t rock heavily when there are big waves. It makes use of wave and solar energy to move it around and provide power. It also has solar panels on the top of the house to generate electricity. And it can recycle all kinds of household waste. A robot controls everything in the house and does the housework. In the kitchen, smart refrigerators and dish washes can automatically work by themselves. A smart oven can cook your favourite dishes. All these things and other advances will make our life much better. 61. The eco houseboat will be ……………. A.in the air B. on the sea C. in the ocean D. on big waves 62. The word “stable” in the second paragraph is closest in meaning to ……………. A. comfortable B. not moving C. not sinking D. Peaceful 63. What is special about the kitchen in the houseboat? A. A robot B. Special dishes C.Smart equipment D. Dish washers 64.Which of the following is NOT true? A. Scientists have built the eco houseboat. B. The eco houseboat can make power. C. The houseboat can recycle waste. D. Our life will be better. 65.What is the main idea of the passage? A. Life in the future B. Generating electricity in the future. C. Shapes and sizes of houses. D. A special kind of house.

a) tìm số hữu tỉ a để a + $\frac{1^2}{a^2}$ là SND b) $\frac{1}{\sqrt{b_1}}$ + $\frac{1}{\sqrt{b_2}}$ +…+ $\frac{1}{\sqrt{b_{100}}}$ =20. CMR trong dãy số đã cho có ≥ 2 số bằng nhau. Cảm được mik tick nha

Read the following passage text then answer the questions by choosing option A,B,C or D Water is one of our most important natural resources. We need (56) ________ it daily to stay alive. We also use water for cooking, cleaning and, of course,(57) ________ and swimming-and for making skating rinks in winter! Water is vital to our economy, too-from growing food to running factories. We also turn the energy of moving water-like Niagara Falls-into (58) _________ power.Like electricity, we expect to have good,clean water at the turn of the tap. It has to travel to us and, after we use it, water (59) ________ and returned to its source-usually nearby rivers or lakes. All of this activity takes energy. Saving water means saving energy. The less water you (60) _______, the less energy is used to pump,treat,distribute and recover it. 56. A. drink B. to drink C. drinking D. drank 57. A. splashing B. splash C. to splash D. splashed 58. A. electric B. geothermal C. hydroelectric D. solar 59. A. treated B. is treated C. treating D. is treating 60. A. use B. using C. are using D. in use

giúp mình với mk đang cần gấp ( đầu bài ở ô ct) cảm ơn mn người nh

vẽ đậu mầm có cái nơ trên đầu - vẽ trên app , hoặc giấy ko ô li buổi sáng ngắm cảnh chill phết

ai làm giuspe e với ạ e cần gấp e cảm ơn

VI. Make questions for the underlined part in each sentence. ( use Wh- words) 1. I like (TV game shows) best. ......................................................................................................... 2. TV viewers can know (about the weather in their regions) from the weather forecast. ......................................................................................................... 3. We go to the zoo (twice a month). ......................................................................................................... 4. We can meet in front of the theater (at 7.30.) ......................................................................................................... 5. Bob likes the comedy (because it makes him laugh.) ......................................................................................................... 6. The documentary lasts (forty-five minutes.) ......................................................................................................... 7.(Steven Spielberg) is the director of the film. ......................................................................................................... 8. On VTV3, there are (three films) on this week. ......................................................................................................... 9. (Millions) of children around the world enjoy the cartoon "Hello Fatty!" ......................................................................................................... 10. Pokémon cartoons are made (in Japan.) .........................................................................................................