5. Metallic bonding

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In this episode, Dr Sunayana Bhargava and Tulela Pea explore metallic bonding and the properties of metals. And they introduce the idea of delocalised electrons. Suitable for: AQA, Edexcel, OCR. For more information on properties on metallic bonding, check out the BBC Bitesize website: https://www.bbc.co.uk/bitesize/guides/ztgy6yc/revision/1 Key learning objectives discussed in this episode include: - Metallic bonding occurs in metallic elements and alloys. - Elements that react to form positive ions are metals. - Elements that do not form positive ions are non-metals. - The majority of elements are metals. Metals are found to the left and towards the bottom of the periodic table. Non-metals are found towards the right and top of the periodic table. - Metals consist of giant structures of atoms arranged in a regular pattern. - The electrons in the outer shell of metal atoms are delocalised and so are free to move through the whole structure. The sharing of delocalised electrons gives rise to strong metallic bonds. - Metals have giant structures of atoms with strong metallic bonding. This means that most metals have high melting and boiling points. - In pure metals, atoms are arranged in layers, which allows metals to be bent and shaped. Pure metals are too soft for many uses and so are mixed with other metals to make alloys which are harder. - Metals are good conductors of electricity because the delocalised electrons in the metal carry electrical charge through the metal. Metals are good conductors of thermal energy because energy is transferred by the delocalised electrons.