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20 Years of Discovery: How Has the Periodic Table Changed Over Time?
The periodic table organizes chemical elements based on atomic weight, electron configurations, and chemical properties, ...
Why are rubies red and emeralds green? Their colors come from the same metal in their atomic structure
Rubies and emeralds have the colors they do because, like many substances, they absorb some colors of light. Most visible light, like sunlight, is composed of all the colors of the rainbow: red, ...