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Walk through any chemistry lab's shelf of reagent bottles and one group stands out immediately by color: vivid blue copper sulfate, deep purple potas

Group 17 of the periodic table, the halogens, fluorine, chlorine, bromine, iodine, and astatine, sits directly opposite the [alkali metals](/blog

Group 1 of the periodic table, the alkali metals, lithium, sodium, potassium, rubidium, cesium, and francium, contains some of the most reactive

Most of the periodic table is defined by what elements do, how eagerly they bond, react, and transform into new compounds. The noble gases, occ

By the mid-1800s, chemists had identified more than 60 elements, but had no reliable way to organize them into a coherent system. Several scientists

Aluminum is one of the most abundant metals in the Earth's crust, yet it wasn't commonly used until well into the 19th century, long after iron and c