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An atom has electrons in 3 energy levels. In the Bohr model of an atom, the number of core electrons is the number of electrons in energy levels...
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Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel
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Once similarity and one difference between a mixture of elements and a mixture of compounds
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An atom has electrons in 3 energy levels. In the Bohr model of an atom, the number of core electrons...
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