Helium

Basic Information		Shells
2 He Helium 4.002602	Historical Information
2 He Helium 4.002602	A French astronomer, Pierre-Jules-César Janssen (1824-1907), first obtained evidence for the existence of helium during the solar eclipse of 1868 in India when he detected a new yellow line (587.49 nm) in the solar spectrum very close to the yellow sodium D-line. I
Name: Helium Symbol: He Atomic number: 2 Atomic weight: 4.002602 (2) Standard state: gas at 298 K	Group in periodic table: 18 Group name: Noble gas Period in periodic table: 1 Block in periodic table: p-block Classification: Non-metallic
Uses	Trivia
filling balloons (blimps) as it is a much safer gas than hydrogen cryogenic applications pressurizing liquid fuel rockets	Helium is one of the so-called noble gases. Helium gas is an unreactive, colourless, and odourless monoatomic gas.