Try our free, interactive periodic table of the elements. Mouse over an element to view details, click on an element for a full summary.

Helium is a noble gas element denoted by the atomic symbol H. It has an atomic number of 2, and the average atomic weight of its isotopes is 4.0026. It is a colorless, odorless gas which is present in all natural gas sources. In many respects, helium...

Helium, the second element in the periodic table, is the second-most abundant element in the universe after hydrogen. It is a noble gas that is unreactive (because of its filled outer electronic shell), colorless, and odorless. Helium is found in great...

Helium is the first member of the noble gas family, the elements that make up Group 18 of the periodic table. Its atomic number is 2, its atomic mass is 4.002602, and its chemical symbol is He. Helium is a colorless, odorless, tasteless gas with a...

Helium Symbol He Atomic Number 2 Atomic Mass 4.002602 Family Group 18 (Viiia) Noble Gas Pronunciation HEE-lee-um Overview Helium is a member of the noble gas family. The noble gases are the elements in Group 18 (VIIIA) of the periodic table. The...

Helium (He) is a colorless, odorless, tasteless, non-toxic, inert monatomic chemical element that heads the noble gas series in the periodic table and whose atomic number is 2. Its boiling and melting points are the lowest among the elements and it...

With the campaign jabber of the 2008 elections already getting loud, an organization that promotes transparency in politics hopes one slice of the Web can promote reasonable, intelligent debate about issues.The Center for Responsive Politics is working with Web startup Helium Inc. to spark public...

A high-flying hello from strangers in Michigan made its way through storms and across several hundred miles, landing recently near a Connecticut woman's home. Marcella Lourd, 80, who lives in the western Connecticut town of Sherman, found a cluster of...

A helium-powered balloon hit a power line and crashed onto a north-central Iowa cattle pasture Friday, killing two men and injuring a third, a sheriff said.The balloon was descending when it hit the line around 9:15 a.m. The balloon and the basket separated and the...

Last weekend, Kent Couch settled down in his lawn chair with some snacks _ and a parachute. Attached to his lawn chair were 105 large helium balloons. Destination: Idaho.With instruments to measure his altitude and speed, a global positioning system device in his pocket, and...