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Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
  • Video
    What's an Ion?

    What's an Ion?

    by Kyle Bardman //basic

    Here is a helpful video providing an overview of ions, including both cations and anions. Courtesy of: Tyler DeWitt

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