The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...

Atoms of non-metal elements gain electrons in some of ... See the study guide on groups in the periodic table for more information.

Both rubies and emeralds are minerals, which is a type of rock with a consistent chemical composition and a highly ordered ...

Mendeleev discovered the periodic table (or Periodic System ... directly followed by a very reactive light metal and then a less reactive light metal. Initially, the table had similar elements in ...

Lithium batteries are in the news constantly. But lithium has plenty of other uses. It's a drug for bipolar disorder. It used ...

For the last fifty or so years, the periodic table has been incomplete. Elements after uranium on the periodic table have been synthesized for the past few decades, but there were always a few ...

One feature of compounds made with transition metals is their intense colour. There are many examples in nature, including ...

Spraying Windex onto the samples produces a color that depends on the metal residing in the dirt ... we asked clubs to create elements of the periodic table featuring a mole. The Period Table of ...

The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...