📚 Nickel in the Reactivity Series | 反应性系列中的镍
The reactivity series is one of the most important ideas in KS3 chemistry. It ranks metals from the most reactive, such as potassium, to the least reactive, such as gold. Nickel is a transition metal that sits in the middle of this series. Its position explains why nickel is shiny, resistant to corrosion, and widely used as a protective coating and in stainless steel.
反应性系列是 KS3 化学中最重要的概念之一。它将金属从最活泼的钾排列到最不活泼的金。镍是一种过渡金属，位于这一系列的中间。它的位置解释了为什么镍光亮、耐腐蚀，并被广泛用作防护镀层和不锈钢成分。
1. What is the Reactivity Series? | 什么是反应性系列？
The reactivity series is a list of metals arranged from most reactive to least reactive. A metal's position helps predict its reactions with oxygen, water, acids, and solutions of other metal compounds. A typical KS3 order is potassium, sodium, calcium, magnesium, aluminium, zinc, iron, nickel, tin, lead, hydrogen, copper, mercury, silver, and gold. Hydrogen is not a metal, but it is placed in the list as a useful dividing line: metals above hydrogen can react with acids to release hydrogen gas, while metals below hydrogen generally cannot.
反应性系列是将金属按最活泼到最不活泼排列的清单。金属的位置有助于预测它与氧气、水、酸以及其他金属化合物溶液的反应。KS3 常见顺序为：钾、钠、钙、镁、铝、锌、铁、镍、锡、铅、氢、铜、汞、银、金。氢不是金属，但作为有用的分界线列入：氢以上的金属能与酸反应放出氢气，氢以下的金属通常不能。
2. Where Does Nickel Sit in the Series? | 镍在系列中的位置？
Nickel is placed after iron and before tin in the reactivity series. In the full sequence, it appears below zinc and iron, meaning nickel is less reactive than both. It is above hydrogen, so it can react with dilute acids, but only slowly. This middle position is key to understanding nickel's chemical behaviour.
镍在反应性系列中位于铁之后、锡之前。在完整序列中，它出现在锌和铁之下，意味着镍不如这两种金属活泼。它在氢之上，因此能与稀酸反应，但反应缓慢。这个中间位置是理解镍化学行为的关键。
3. Comparing Nickel with Iron and Zinc | 镍与铁、锌的比较
Because zinc and iron are more reactive than nickel, they can displace nickel from its compound solutions. Iron can push nickel out of nickel sulfate solution, and zinc can do the same even faster. However, nickel cannot displace zinc or iron from their compounds. This order matters when choosing a metal to protect another metal from corrosion.
由于锌和铁比镍活泼，它们能从镍化合物溶液中置换出镍。铁能将镍从硫酸镍溶液中置换出来，锌置换镍的速度更快。但镍不能从锌或铁的化合物中置换出它们。这个顺序在选择一种金属保护另一种金属免受腐蚀时很重要。
4. Nickel and Acids | 镍与酸的反应
Nickel reacts slowly with
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