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The difference between the atomic number of an element and the element’s atomic mass is the number of ions.
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Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.
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3CaCl2 + Al2O3 —> 3CaO + 2AlCl...
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