As of 2014, there are 84 metal elements on the Periodic Table of Elements, four of which are unnamed at this time. Metals are one of three classifications of the elements: there are metals, nonmetals and metalloids. Name... More »

The most reactive metal in the periodic table is francium. Francium belongs to the alkali metals, a group on the periodic table whose members are all highly reactive. These metals are highly reactive because they all hav... More »

Three elements on the periodic table are magnetic: iron, nickel and cobalt. There are also a number of metals that take on slight magnetic properties when subjected to a magnetic field. More » Science Chemistry Atoms & Molecules

When Dmitri Mendeleev created the Periodic Table of the Elements, he decided against arranging them by their atomic numbers based on his correct assumption that those numbers were not totally accurate. When he first bega... More »

Some elements on the periodic table are oxygen, helium, arsenic and fluorine. Oxygen is an odorless, tasteless and colorless gas at room temperature, but is bright blue as a liquid. Oxygen is a very reactive element and ... More » Science Chemistry

The periodic table was built to show the relationships among the various elements. The periodic table was constructed in 1869 by Dmitri Mendeleev. More »

The periodic table was invented by chemist Dmitri Mendeleev to organize and compare elements and understand their relations with each other. Mendeleev created the periodic table between 1868 and 1870 while writing his bo... More »