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Chemistry GCSE Definitions
Member rating: No Rating | Words: | Submitted: Tue Mar 15 2005
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UNIT 1 - Structure and Bonding Atomic structure Proton - +1 Electron - weighs 1/1836 -1 Neutron - changes for isotopes (neutral) Isotopes do not change the atomic number, but increase the mass number because of the increase in neutrons, This will change the relative atomic mass depending on spread of isotopes. Mass spectrometry, sample in gaseous state vaporised, and bombarded with electrons, forming positive ions which are accelerated and passed by a magnet which then splits apart different strengths, forming a graph showing abundance of different species. Can find isotopes Relative atomic mass can be calculated First ionisation energy The amount of energy required to remove one mole of electrons from each atom in the gas phase to form a singly positive ion. Second ionisation energy The amount of energy required to remove the next electron from an atom. Requires more energy after the first, since this will usually lead to open electrons, or electrons left in unfilled shells. Jump to between...
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