trung tâm ôn - luyện
Phan
bài khảo sát
Kin thc cn bn Luyn thi i hc
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2-
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-
(Z = 9); Na, Na
+
(Z = 11), Mg, Mg
2+
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kính hạt là:
A. O
2-
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-
, Na, Na
+
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2+
, Al. B. Na, Mg, Al, Na
+
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2+
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2+
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+
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2+
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2-
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-
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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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