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Radioactivity loading

Discusses elements that emit radioactive particles and how they were discovered.

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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.
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    by Whakuk Lee //at grade
    방사능과 방사선의 정의와 발견. 방사성 원소의 예
    This indicates how strong in your memory this concept is
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