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2 năm trước
Nguyên tử A có phân lớp e chiếm mức năng lượng cao nhất là 3s1 và số hạt mang điện âm ít hơn số hạt không mang điện là 1. Nguyên tử B có số nơtron nhiều hơn số nơtron của nguyên tử A là 4. Nếu cho 4,8g B tác dụng với một lượng A dư thì thu được 11,7g A2B. Nguyên tử A và B là kim loại hay phi kim? Xác định tên Nguyên tố A, B
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