Elements in group 1 and group 2 are metals. Atoms of group 1 elements ... See the study guide on groups in the periodic table for more information.

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

This year we celebrate the 150 th anniversary of Mendeleev’s achievement in formulating the structure of the periodic table that we use today ... Rendus' describing relationships between groups of ...

4th Period: Potassium and Calcium—Electrons go into the fourth energy level. A small piece of sodium metal is placed in water. The sodium reacts with the water and gets very hot, producing sodium ...

Take your pick from this collection of links about elements and the periodic table! Build an element ball ... Spraying Windex onto the samples produces a color that depends on the metal residing in ...

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 ...

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 ...