📚 The Magic Number 720: Understanding Buckminsterfullerene | 神奇数字720：认识巴基敏斯特富勒烯
In the world of IGCSE Science, the number 720 is not just an arbitrary integer. It is the relative molecular mass of buckminsterfullerene (C₆₀), a fascinating allotrope of carbon. This article will take you through the structure, bonding, properties and uses of C₆₀, all tied directly to your Edexcel IGCSE Chemistry syllabus.
在IGCSE科学的世界里，数字720并不仅仅是一个任意整数。它是巴基敏斯特富勒烯（C₆₀）的相对分子质量——一种迷人的碳同素异形体。本文将带你系统了解C₆₀的结构、成键、性质与用途，并紧密对应Edexcel IGCSE化学考纲。
1. What Does 720 Represent? | 720代表什么？
The formula of buckminsterfullerene is C₆₀. Each molecule contains exactly 60 carbon atoms.
巴基敏斯特富勒烯的化学式为C₆₀。每个分子恰好含有60个碳原子。
Since the relative atomic mass of carbon (Aᵣ) is 12, the relative molecular mass (Mᵣ) is calculated by adding up the relative atomic masses of all atoms in the molecule.
由于碳的相对原子质量（Aᵣ）为12，因此相对分子质量（Mᵣ）需要将分子中所有原子的相对原子质量相加。
Mᵣ(C₆₀) = 60 × Aᵣ(C) = 60 × 12 = 720
So the number 720 uniquely identifies the C₆₀ molecule in chemical calculations.
因此数字720在化学计算中唯一对应C₆₀分子。
2. Carbon: The Basis of C₆₀ | 碳：C₆₀的基础
Carbon has atomic number 6 and electronic configuration 2,4.
碳的原子序数为6，电子排布为2,4。
With four outer electrons, carbon can form four covalent bonds to achieve a full outer shell.
由于有4个外层电子，碳可以形成4个共价键以达到稳定的满外层结构。
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Carbon’s ability to form strong covalent bonds with other carbon atoms leads to a huge variety of structures.
碳能与其它碳原子形成强共价键，因此产生种类繁多的结构。
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These different structures are called allotropes.
这些不同的结构被称为同素异形体。
3. Allotropes: Different Forms of Carbon | 同素异形体：碳的不同形式
Allotropes are different structural forms of the same element in the same physical state.
同素异形体是同一元素在同一种物理状态下的不同结构形态。
Because the atoms are arranged differently, allotropes often have very different physical and chemical properties.
由于原子排列方式不同，同素异形体的物理和化学性质往往差异巨大。
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Common carbon allotropes include diamond, graphite, graphene and fullerenes.
常见的碳同素异形体包括金刚石、石墨、石墨烯和富勒烯。
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C₆₀ is one type of fullerene.
C₆₀是富勒烯的一种。
4. Diamond: The King of Hardness | 金刚石：硬度之王
In diamond, every carbon atom is bonded to four other carbon atoms by strong covalent bonds.
在金刚石中，每个碳原子都与另外4个碳原子通过强共价键相连。
This giant covalent structure forms a rigid three-dimensional network.
这种巨大的共价结构形成了一个坚固的三维网络。
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Diamond is the hardest natural substance known.
金刚石是已知自然界中最硬的物质。
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It does not conduct electricity because all four outer electrons are used in covalent bonds.
它不导电，因为4个外层电子全部用于形成共价键。
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Diamond is used in cutting tools and as gemstones.
金刚石用于切割工具和宝石。
5. Graphite: The Black, Slippery Solid | 石墨：黑色光滑固体
In graphite, each carbon atom is bonded to only three other carbon atoms.
在石墨中，每个碳原子只与另外3个碳原子成键。
The carbon atoms are arranged in flat hexagonal layers, and the layers are held together by weak intermolecular forces.
碳原子排列成平面六边形片层，层与层之间以微弱的作用力结合。
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Because the layers can slide over each other, graphite is soft and acts as a lubricant.
由于片层之间可以滑动，石墨柔软并可作润滑剂。
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The fourth outer electron of each carbon atom is delocalised, allowing graphite to conduct electricity.
每个碳原子的第4个外层电子发生离域，使石墨能够导电。
6. Discovering C₆₀ | 发现C₆₀
C₆₀ was discovered in 1985 by Harold Kroto, Robert Curl and Richard Smalley during experiments on laser-vaporised graphite.
C₆₀于1985年由哈罗德·克罗托、罗伯特·柯尔和理查德·斯莫利在激光气化石墨的实验中首次发现。
The discovery opened up an entirely new area of chemistry and earned the scientists the Nobel Prize in Chemistry in 1996.
这一发现开辟了化学领域的新篇章，并为科学家们赢得了1996年的诺贝尔化学奖。
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The football-shaped structure was a complete surprise to chemists.
这种足球状结构让化学家们大为震惊。
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The name comes from the architect Buckminster Fuller, whose geodesic domes resemble the molecule.
其名称来源于建筑学家巴克敏斯特·富勒，他的网格穹顶与这种分子形状相似。
7. The Structure of C₆₀ | C₆₀的结构
C₆₀ is a hollow sphere made up of 60 carbon atoms arranged in 12 pentagons and 20 hexagons.
C₆₀是一个中空球体，由60个碳原子排列成12个五边形和20个六边形。
Each carbon atom is bonded to exactly three other carbon atoms, so the molecule has 90 covalent bonds in total.
每个碳原子恰好与另外3个碳原子成键，因此分子中共有90个共价键。
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There are both single and double carbon-carbon bonds in the molecule.
分子中既存在碳碳单键，也存在碳碳双键。
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The overall structure is a cage with
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