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nguyenthibichngoctlck
2 năm trước
Helpp mee R là một nguyên tố phi kim ở nhóm VII trong hệ thống tuần hoàn. Hợp chất khí của R với hiđrô chứa 2, 74% hiđro về khối lượng. a. Xác định tên nguyên tố R . Nêu tính chất của R b. So sánh R với các nguyên tố lân cận.
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