Edexcel A-Level Chemistry: Electron Configuration and Orbital Filling | 爱德思 A-Level 化学：电子构型与轨道填充

📚 Edexcel A-Level Chemistry: Electron Configuration and Orbital Filling | 爱德思 A-Level 化学：电子构型与轨道填充

Understanding electron configuration is essential for predicting an element’s chemical and physical properties. In Edexcel A-Level Chemistry, you must be able to write configurations for atoms and ions using s, p and d subshell notation, and explain anomalies such as chromium and copper.

理解电子构型对于预测元素的化学和物理性质至关重要。在爱德思 A-Level 化学中，你必须能用 s、p、d 亚层符号书写原子和离子的电子构型，并解释铬和铜等异常现象。

1. Why Electron Configuration Matters | 为什么电子构型重要

Electron configuration describes how electrons are arranged in orbitals around the nucleus. It determines an element’s oxidation states, atomic radius, ionisation energy and bonding behaviour. The Edexcel specification requires you to link configuration to position in the Periodic Table.

电子构型描述电子在原子核外轨道中的排布方式。它决定元素的氧化态、原子半径、电离能和成键行为。爱德思考试大纲要求你将电子构型与元素周期表位置联系起来。

2. Principal Quantum Shells | 主量子壳层

Electrons occupy principal quantum shells labelled n = 1, 2, 3, 4… The first shell holds up to 2 electrons, the second

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