📚 Year 12 Edexcel Chemistry: Vocabulary & Terminology Quick Memory Guide | Year 12 Edexcel 化学：词汇术语速记指南
Mastering Chemistry at Year 12 requires not only understanding concepts but also memorising a broad range of technical vocabulary. This guide breaks down the essential terms into 10 thematic sections, each with memory hooks, visual associations and exam-focused definitions. By linking the English terms to simple Chinese explanations and mnemonics, you can strengthen both your language skills and your grasp of the subject.
掌握 Year 12 化学，不仅需要理解概念，还需要记住大量专业术语。本指南将核心词汇按 10 个主题分类，每一条都配有记忆窍门、直观联想和贴切考试的释义。通过将英文术语与简明中文解释和助记法相结合，你可以同时提升语言能力和学科理解。
1. Atomic Structure | 原子结构
Atomic Number (Z): the number of protons in the nucleus, which determines the identity of the element. (Memory: Z is like a 'Zoo pass' — it gives the element its unique identity.)
原子序数 (Z): 原子核内的质子数，决定元素种类。（速记：Z 像身份证号，唯一标识元素。）
Mass Number (A): total number of protons and neutrons in the nucleus. (A = All nucleons together.)
质量数 (A): 质子与中子的总数。（助记：A 代表全部核子。）
Isotopes: atoms of the same element with the same number of protons but different numbers of neutrons. (Link to 'same place' in the periodic table.)
同位素: 质子数相同、中子数不同的同种元素原子。（联想：同位即周期表中同一位置。）
Relative Atomic Mass (Aᵣ): the weighted average mass of an atom relative to 1/12th of the mass of a carbon-12 atom. (Just a weighted average of isotopic masses.)
相对原子质量 (Aᵣ): 相对于碳-12 原子质量 1/12 的加权平均质量。就是同位素质量的加权平均值。
First Ionisation Energy: the energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous 1+ ions. (Down a group it decreases; across a period it generally increases.)
第一电离能: 从气态原子移去 1 mol 电子形成 1 mol 气态 1+ 离子所需的能量。（同族往下减小，同期从左到右总体增大。）
2. Periodic Table & Periodicity | 元素周期表与周期性
Period: a horizontal row in the periodic table; the period number tells you the number of electron shells. (Rhyme: 'Row is a period'.)
周期: 周期表中的横行；周期数等于电子层数。（口诀：横行是周期。）
Group umber of outer-shell electrons and similar chemical properties. (Group = same valence e⁻.)
族: 纵列；同族元素外层电子数相同，化学性质相似。
Atomic Radius Trend: decreases across a period (increased nuclear charge pulls electrons in) and increases down a group (added shells). (Imagine squeezing a balloon.)
原子半径趋势: 同期从左到右减小（核电荷增大，引力增强）；同族从上到下增大（电子层增加）。像挤气球一样。
Electronegativity: the ability of an atom to attract the bonding pair of electrons in a covalent bond. (Fluorine is the most electronegative; 'F is the electron hog'.)
电负性: 原子在共价键中吸引键合电子的能力。（氟电负性最强，“电子霸占者”氟。）
3. Chemical Bonding & Structure | 化学键与结构
Ionic Bonding: electrostatic attraction between oppositely charged ions, typical of metal + non-metal. (Electron transfer, like giving a gift.)
离子键: 带相反电荷离子间的静电引力，常见于金属与非金属之间。电子转移，如同赠送礼物。
Covalent Bonding: sharing of electron pairs between atoms, usually non-metals. (Share to complete octet.)
共价键: 原子间共用电子对，通常是非金属之间。共享以达成八电子稳定结构。
Metallic Bonding: attraction between positive metal ions and a 'sea' of delocalised electrons. (Electrons flow like a sea around islands of cations.)
金属键: 金属阳离子与离域电子“海洋”间的引力。电子如同海洋包围着阳离子岛屿。
VSEPR Theory: Valence Shell Electron Pair Repulsion; electron pairs repel each other to determine molecular shape. (Count electron pairs around central atom to predict shape: 2 pairs linear, 3 trigonal planar, 4 tetrahedral, etc.)
VSEPR 理论: 价层电子对互斥理论；电子对互相排斥决定分子形状。中心原子周围电子对数：2 为直线形，3 为平面三角形，4 为四面体形等。
Polar Bond: covalent bond with unequal sharing of electrons due to difference in electronegativity. (Creates a dipole, δ⁺ and δ⁻.)
极性键: 因电负性不同导致电子对非均等共享的共价键，形成偶极（δ⁺ 和 δ⁻）。
4. Redox Reactions | 氧化还原反应
Oxidation: loss of electrons; also increase in oxidation number. (OIL: Oxidation Is Loss of electrons.)
氧化: 失去电子；氧化数升高。助记：OIL——失电子为氧化。
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