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Câu 3. Cho các hạt vi mô: O
2-
(Z = 8); F
-
(Z = 9); Na, Na
+
(Z = 11), Mg, Mg
2+
(Z = 12), Al (Z = 13). Thứ tự
giảm dần bán kính hạt là:
A. O
2-
, F
-
, Na, Na
+
, Mg, Mg
2+
, Al. B. Na, Mg, Al, Na
+
, Mg
2+
, O
2-
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-
C. Na, Mg, Al, O
2-
, F
-
, Na
+
, Mg
2+
. D. Na
+
, Mg
2+
, O
2-
, F
-
, Na, Mg, Al.
Câu 4. Nguyên tử của nguyên tố X có cấu hình electron ở 2 phân lớp ngoài cùng là 3d
2
4s
2
. Vị trí trong bảng
tuần hoàn của X là:
A. chu kì 4, phân nhóm chính nhóm IV. B. chu kì 4, phân nhóm phụ nhóm IV.
C. chu kì 4, phân nhóm chính nhóm II. D. chu kì 4, phân nhóm phụ nhóm II.
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