See if you can organize the first 25 elements of the periodic table in order in the quiz below. The periodic table as we know ...

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

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 ...

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...

Just four years before Mendeleev announced his periodic table, Newlands noticed that there were similarities between elements with atomic weights that differed by seven. He called this The Law of ...

4) they are shown as a natural transition from the elements of Group VIII to those of Group I. rare earths in relation to the periodic table. The group of elements known as the “rare earths ...

This year marks the 150th anniversary of the publication of Mendeleev’s Periodic Table of Chemical Elements in 1869. In celebration, the United Nations Educational, Scientific, and Cultural ...