AQA · Chemistry · 8462
GCSE Chemistry (AQA): Metallic Bonding
Topic 2 — Bonding, Structure & Properties of Matter. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Metallic Bonding - Properties of Metals | Alloys & Pure Metals (2027/28 exams)"; each card deep-links to the moment in the video it came from. Lesson 2.1 of Cognito's AQA GCSE Combined Science (Trilogy) and Chemistry course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-c_2.1.
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Why is an alloy harder than a pure metal?
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The different sized atoms distort the regular layers, so the layers can no longer slide over one another.
Metallic bonding is the strong electrostatic attraction between positive metal ions and ? electrons.
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delocalised
Which three metals are sometimes added to steel to alter its properties?
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Chromium, manganese and vanadium.
What does it mean that a metal is malleable?
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It can easily be bent or hammered into shapes, such as thin sheets.
Why do metal atoms become positive ions in a metallic structure?
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They lose their negatively charged outer shell electrons to the sea of delocalised electrons.
What type of bonding occurs between metal atoms?
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Metallic bonding.
Steel is an alloy made mostly of iron with 1–2% ?.
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carbon
What is an alloy?
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A mixture containing two or more different elements, at least one of which is a metal.
Why are metals good conductors of electricity and heat?
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Their delocalised electrons are free to move and carry electrical current and thermal energy through the structure.
What happens to the outer shell electrons of metal atoms in a metal?
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They are given up and shared with all the other atoms, becoming delocalised and free to move through the structure.
Why do most metals have high melting and boiling points?
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The electrostatic attraction between positive ions and delocalised electrons is strong, so a lot of energy is needed to break the metallic bonds.
Why are pure metals malleable?
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Their atoms are arranged in regular layers that can slide over one another.
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