Nguyên tử X có hạt là 52. trong đó số hạt mang điện nhiều hơn số hạt không mang điện là 16. a) Tìm số p,n và e trong nguyên tử X b, Hãy vẽ sơ đồ cấu tạo của nguyên tử X c, Hãy viết tên kí hiệu hóa học và nguyên tử khối của nguyên tố X

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Sydney is Australia's most exciting city. The history of Australia begins here. In 1788 Captain Arthur Philips arrived in Sydney with 11 ships and 1624 passengers from Britain (including 770 prisoners). Today there are about 3.6 million people in Sydney. It is the biggest city in Australia, the busiest port in the South Pacific and one of the most beautiful cities in the world. In Sydney, the buildings are higher, the colors are brighter and the nightlife is more exciting. There are over 20 excellent beaches close to Sydney and its warm climate and cool winter have made it a favorite city for immigrants from overseas. There are two things that make Sydney famous: its beautiful harbor, the Sydney Harbor Bridge, which was built in 1932 and the Sydney Opera House, which was opened in 1973. 28. Where does the history of Australia begin? A. South Pacific B. North Pacific C. Britain D. Sydney 29. Which of the following should be the title of the reading passage? A. Sydney's Opera House B. The history of Sydney C. Sydney's beaches and harbors D. An introduction of Sydney 30. Which of the following statement is NOT true about Sydney? A. Sydney is the smallest city in Australia. B. Sydney is one of the most beautiful cities in the world. C. Sydney is the most exciting city in Australia. D. Sydney is a favorite city for immigrants from overseas. 31. How many beaches are there close to Sydney? A. Fewer than 20 beaches B. Nearly 20 beaches C. More than 20 beaches D. Less than 20 beaches 32. When was the Sydney Harbor Bridge built? A. In 1788 B. In 1932 C. In 1973 D. In 1624