Hai nguyên tố X và Y ở 2 nhóm A liên tiếp trong bảng tuần hoàn. X thuộc nhóm V. Ở trạng thái đơn chất X và Y không phản ứng với nhau. Tổng số proton của X và Y bằng 23. Xác định hai nguyên tố và viết cấu hình electron nguyên tử của chúng.

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