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Classifying Chemicals
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Chemistry Revision Notes - Classifying Chemicals Periodic Table - chemical elements arranged in order of increasing atomic number. Arranged in rows so that elements with similar properties are in the same columns (groups). An element is a pure substance that cannot be chemically broken down into anything simpler e.g. hydrogen, oxygen, nitrogen and magnesium. Group 1 of periodic table: The Alkali Metals: These are all very reactive metals, forming compounds with almost all of the non-metals. The alkali metals are hazardous substances and are stored under inert (unreactive) oils. When these metals are freshly cut (exposed to the air), they quickly become coated with corrosion products. Alkali metals are kept in oil because: 1. Prevents contact with O2 so the metal does not corrode. 2. Prevents contact with water and moisture in the air. The transition metals: These metals, found in the centre of the periodic table, have high melting points. Their compounds are usually coloured e.g. blonde hair contains...
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