📚 Transition Elements Properties and Exam Review | 过渡元素性质与考点梳理
Transition elements are a key topic in IB Chemistry HL, appearing in both Paper 1 and Paper 2. This article provides a complete review of their properties, electronic configurations, complex chemistry, and the exam points you must master.
过渡元素是IB化学HL的核心主题，在Paper 1和Paper 2中都会出现。本文将系统梳理它们的性质、电子构型、配合物化学以及你必须掌握的考点。
1. Definition and Electron Configuration | 定义与电子构型
In IB Chemistry, a transition element is defined as an element that forms at least one stable ion with a partially filled d subshell. This definition excludes scandium (Sc³⁺ is d⁰) and zinc (Zn²⁺ is d¹⁰).
在IB化学中，过渡元素的定义是：能形成至少一种具有部分填充d亚层的稳定离子。这个定义排除了钪（Sc³⁺ 为 d⁰）和锌（Zn²⁺ 为 d¹⁰）。
Transition elements are located in the d-block of the periodic table, between the s-block and p-block. Their typical 3d examples include titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), and copper (Cu).
过渡元素位于周期表的d区，介于s区和p区之间。常见的3d过渡元素包括钛（Ti）、钒（V）、铬（Cr）、锰（Mn）、铁（Fe）、钴（Co）、镍（Ni）和铜（Cu）。
You must remember the exceptions in electron configuration:
你必须记住电子构型中的例外情况：
- Cr: [Ar] 3d⁵ 4s¹ (not 3d⁴ 4s²) – 铬的电子构型为 [Ar] 3d⁵ 4s¹，而不是 3d⁴ 4s²。
- Cu: [Ar] 3d¹⁰ 4s¹ (not 3d⁹ 4s²) – 铜的电子构型为 [Ar] 3d¹⁰ 4s¹，而不是 3d⁹ 4s²。
When forming ions, the 4s electrons are lost first. For example, Fe²⁺
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