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nthuyentrang
2 năm trước
Nguyên tử y có số hạt trong nhân nhiều hơn số hạt ở vỏ là 18 hạt, tổng số hạt mang điện là 34. Xác định số khối, số hiệu và biểu diễn ký hiệu nguyên tử
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Đọc đoạn văn trả lời câu hỏi: Van, a student from Ho Chi Minh City, is an exchange student in the USA. He is now living with the Parker family on a farm 100 kilometers outside Columbus, Ohio. He will stay there till the beginning of October. Mr. Parker grows maize on his farm, while Mrs. Parker works part-time at a grocery store in a nearby town. They have two children. Peter is the same age as Van, and Sam is still in primary school. Since Van arrived, he has been learning a lot about life on a farm. In the afternoon, as soon as he completes his homework, he feeds the chickens and collects their eggs. On weekends, if Mr. Parker is busy, the three boys help him on the farm. On Saturday afternoons. Peter plays baseball. The Parker family and Van eat hamburgers or hot dogs while they watch Peter play. The Parkers are nice so Van feels like a member of their family. Câu1. What does Van do in the afternoon? Câu2. Why does Van feel like a member of the Parkers?

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