The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

The modern periodic table is based closely on the ideas he used ... For example, lithium (Li), sodium (Na) and potassium (K) all have the same kind of reaction with water. The group of elements ...

A chemical element is one of those squares on the periodic table that adorns many a classroom wall. Sure. But what is an element really? It is a more subtle question that you might realise.

Want to learn more about this centerpiece of chemistry? Take your pick from this collection of links about elements and the periodic table! Build an element ball, solve periodic puzzles, and check out ...

The modern periodic table is based closely on the ideas he used ... For example, lithium (Li), sodium (Na) and potassium (K) all have the same kind of reaction with water. The group of elements ...