Câu 10: Nguyên tố Cu có hai đồng vị bền là 63 29 Cu và 65 29 Cu . Nguyên tử khối trung bình của Cu là 63,54. a. Tính tỉ lệ % của mỗi đồng vị? b. Tính % khối lượng của 63 29 𝐶𝑢 𝑡𝑟𝑜𝑛𝑔 𝐻22963𝑆𝑂4? 𝑏𝑖ế𝑡 𝑆=32,𝑂=16 Câu 11: Tổng số hạt p,n,e trong nguyên tử X là 87. Viết cấu hình e của X?

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