Определите число электронов на 3d-подуровне у Mn, Mn²⁺, Mn⁴⁺.
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5, 4, 3
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5, 4, 4
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5, 5, 5
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5, 5, 3
📝 Detailed explanation
Mn (Z=25): [Ar]3d⁵4s². Mn²⁺: [Ar]3d⁵ (отдаёт 4s²). Mn⁴⁺: [Ar]3d³.
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