To differentiate between metals and non-metals, you can use the following physical properties:
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Malleability: Metals are typically malleable, meaning they can be hammered or rolled into sheets without breaking. Non-metals are generally brittle and cannot be shaped in the same way.
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Conductivity: Metals are good conductors of electricity and heat, while non-metals are usually poor conductors (or insulators).
Transparency is not a standard property used to differentiate between the two, as both metals and non-metals can vary in transparency.
So, the key properties you would use are malleability and conductivity.