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Metallic Bonding (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Metallic Bonding' from the broader topic Bonding, Structure, And The Properties Of Matter. The test is geared towards the AQA exam board style syllabus.
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Why does increasing the number of delocalised electrons per atom generally increase metallic bond strength?
How do metallic bonds differ in strength across the periodic table?
Which real-world application relies on metallic bonding to function?
Which of the following best describes why alloys often have higher melting points than pure components?
Why are metals generally insoluble in water?
Why do transition metals often have higher densities and tensile strengths than alkali metals?
Which description applies to the “sea of electrons” model?
Why are metals often used as catalysts in chemical reactions on their surfaces?
Which statement explains density differences between metals?
In terms of bonding, why do metallic crystals conduct electricity in the solid state?
Why do alloys (e.g. steel) tend to be stronger than pure metals?