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Science Alive: Synthetic vs. Natural: What's the Difference?
Through this reading, young scholars will learn that a substance's properties arise from its molecular structure, not from how it's made (i.e., synthesized by people or found in nature). There is no fundamental difference between natural...
Sophia Learning
Sophia: Atomic Mass: Lesson 4
This lesson explains what is represented by the atomic mass, and how it varies from one element to the next. Module includes a slideshow and a quiz.