For one thing, the modern table has a bunch of elements that Mendeleev overlooked (and failed to leave room for), most notably the noble gases (such as helium, neon, argon). And the table is oriented ...

The column at the far right holds the noble gases, named for their general unwillingness to interact with other elements. When Dmitrii Mendeleev proposed his periodic table 150 years ago, no one ...

This video excerpt from NOVA's "Hunting the Elements" explains why some elements are more reactive than others.

He misplaced some elements, and his table was incomplete, even with his predictions: the group of so-called noble gases, for example, was discovered in the 1890s and was not anticipated in his papers.

Translated from the German word Edelgas, noble gases commonly refer the six elements occupying the rightmost column of the periodic table: helium, helium (He), neon (Ne), argon (Ar), krypton (Kr), ...

Sir William Ramsay, the Scottish chemist who discovered several noble gases, is the subject of today’s Google doodle. The noble gases are a group of chemical elements with very low reactivity ...

Like all noble gases, xenon is colourless, odourless and inflammable — but it is also more reactive, and much rarer, than its lighter relatives. Ivan Dmochowski ponders how xenon, though ...