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1. Particles of an element are called atoms.
2. Can be classified based on their properties.
3. Metalloids have properties of metals and nonmetals.
4. Metals tend to be shiny solids.
5. Nonmetals conduct heat and electric current poorly.

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1.  Made of elements not present in a fixed ratio.
2. Sometimes you can easily separate the components and sometimes you can't.
3. A mixture that separates easily: sugar and sand, that does not: salt and water.
4. Solubility refers to the ability of a solute to dissolve in a solvent at certain temperatures.
5. Sodium Sulfate does not increase in solubility when heated.

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1. Every compound has a unique set of properties.
2. Broken down by heat or electricity.
3. Most elements take part in chemical changes easily, they are rarely found in pure form in nature.
4. Two or elements combine to form a compound.
5. Properties are used to tell compounds apart.