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Metal compounds
Member rating: No Rating | Words: | Submitted: Mon Jun 28 2004
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Topic 1 Metal compounds Element = substance made from one type of atom E.g. Al aluminium Compound = 2 or more elements chemically bound E.g. CO2 Atomic number = the no. of protons in one atom of an element E.g. Li37 Mass number = the total number of protons and neutrons in one atom of one element E.g. Li37 Isotopes = two or more atoms with the same number of protons and electrons but different numbers of neutrons. E.g. Cl35 Cl37 Mass spectrometer = most accurate method of determining atomic and molar masses. Method of use * Sample is vaporised * Positive ions produced from vapour * +ve ions accelerated by electric field * ions deflected by magnetic field * ions detected Used to determine the average mass of atoms that have isotopes Isotopic Mass Number of atoms in 100 atoms mixture Mass of isotope in 100 atoms of mixture 204.0 2 408 206.0 24 4944 207.0 22 4554 208.0 52 10816 20722 Average mass 1 atom = 20722/100 = 207.2 atomic mass units Determining relative atomic...
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