A metal is generally considered to be a pure element which readily forms cations. Metals are characterised by their opacity and high thermal and electrical conductivities, the latter properties resulting from the delocalised and mobile nature of the electrons over the crystal structure.

Generally a flat piece of material with a threaded hole which can be screwed onto a bolt to fasten items together. Nuts typically have a hexagonal external shape. Nuts are available in metric and inch-threaded sizes.

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