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2 năm trước
tổng số hạt trong nguyên tử của 1 nguyên tố x là 58 số hạt trong nhân lớn hơn số hạt ở vỏ là 20 a tìm tên của x b cho 1,95g x vào nước . tính thể tích khí thoát ra ở đktc giúp mình đang gấp huhuhu
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