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Loan1234
2 năm trước
Giúp em nha ^^ Câu 1: Cấu hình electron lớp ngoài cùng của nguyên tử các nguyên tố halogen là A. ns²np⁴  B. ns²np⁵   C. ns²np³   D. ns²np⁶ Câu 2: Trong nhóm halogen, sự biến đổi tính chấ nào sau đây của đơn chất đi từ flo đến iot là đúng? A. Ở điều kiện thường, trạng thái tập hợp chuyển từ thể khí sang thể lỏng và rắn. B. Màu sắc nhạt dần. C. Nhiệt độ nóng chảy giảm dần. D. Tính oxi hóa tăng dần.
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