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 »

Helium is a nonmetal element. It is the second element on the periodic table, following hydrogen, and is part of the highly stable noble gas group. Noble gas elements are known for their low reactivity due to their full ... More »

Lead is a metal element that is solid at room temperature. It has a boiling point of 3,180 degrees Fahrenheit, a melting point of 621.34 degrees F and a density of 11.342 grams per cubic centimeter. The element has an at... More »

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 »

The periodic table's name comes from the fact that it arranges the elements into repeating sets, otherwise known as "periods." These periods are defined by the covalence of an element, the number of electrons it has in i... More »

The horizontal rows on the periodic table of the elements are called periods. Every element in a period has the same number of atomic orbitals. For instance, hydrogen and helium are in the first period, so they both have... More »

There are 118 known elements on the periodic table. The most recently discovered element, Ununoctium, was first reported by Russian scientists from Dubna in 2002. More »