Learn what the most reactive metal and most reactive element on the periodic table are. See why there are multiple answers to the question.
Anne Helmenstine
Learn about Mendeleev's periodic table, including when it was made, its importance, and how it differs from the modern periodic table.
Mendeleev’s Periodic Table
Find names made from periodic table element symbols. Add names not on the list and improve this resource for other readers.
List of Names Made From Periodic Table Element Symbols
Learn about the evaporative cooler. See how it works, get examples, and find out when evaporative cooling does and does not work.
Evaporative Cooler – How It Works and Examples
Get the coin toss probability formula and examples of common math problems and word problems dealing with probability.
Coin Toss Probability Formula and Examples
Learn how aurora colors work. See the chemistry and physics of the northern and southern lights and how the aurora works on other planets.
Aurora Colors Explained – Southern and Northern Lights
Get the control group definition and examples in an experiment. Learn how the control group differs from the a control variable.
Control Group Definition and Examples
Learn what the placebo effect is, how it works, and its uses in scientific research, medicine, and psychology.
Placebo Effect – What It Is and How It Works
Get neptunium facts, including the history of its discovery, the element's uses, and its chemical and physical properties.