It wasn’t until 1913, six years after Mendeleev’s death that the final piece of the puzzle fell into place. The periodic table was arranged by atomic mass, and this nearly always gives the same order ...

However, the elements never move places. The periodic table's layout means we can make predictions about elements based on their position on the periodic table. It is this structure that makes it ...

Take your pick from this collection of links about elements and the periodic table! Build an element ball ... and related developments in chemistry that took place during the late 1700s and early ...