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IN the Philosophical Magazine for April, 1903, Runge and Precht work out the atomic weight of radium from its spectrum to be 258, instead of the 225 found by Madame Curie. I should like to point out ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...