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The top documents tagged [unreactive gases]
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unreactive gases
3-7 Representitive Groups
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Elements are arranged: Vertically into Groups Horizontally Into Periods.
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Beta Science Mr. McMartin. Element: a substance that cannot be separated or broken down into simpler substances by chemical or physical means. Pure.
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Chapter 5 Periodic Table Mendeleev noticed that when the elements were arranged in order of increasing atomic mass, certain similarities in their chemical.
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