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An atom starts with 20 electrons and 20 protons; after a reaction, it has 18 electrons and 20 protons.
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Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.
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What forms when chemical reactions combine pollution with sunlight?
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Based on its chemical properties, identify the position of each chemical family on the periodic table.
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Which of the following units is not an official si unit
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An atom starts with 20 electrons and 20 protons; after a reaction, it has 18 electrons and 20 proton...
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