and who was the first to discover it?
Georges Rayet
Helium
elium is named for the Greek Titan of the Sun, Helios. It was first detected as an unknown, yellow spectral line signature in sunlight, during a solar eclipse in 1868 by Georges Rayet, 
what is the meaning of metals and nonmetals in science It is a chemical element that mostly lacks the characteristics of a metal can you name some of its properties? Physically, they largely exist as diatomic or monatomic gases, with the remainder having more substantial (open-packed) forms, unlike metals, which are nearly all solid and close-packed. which are some of its categories? They can be divided into the two categories of "reactive nonmetal," and "noble gas. can you name some gases that fall under the second one? Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn) when was the first gas mentioned discovered? In 1868 during a solar eclipse
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Helium [SEP] Introduction
This is due to the very high nuclear binding energy (per nucleon) of helium-4, with respect to the next three elements after helium. This helium-4 binding energy also accounts for why it is a product of both nuclear fusion and radioactive decay. Most helium in the universe is helium-4, the vast majority of which was formed during the Big Bang. Large amounts of new helium are being created by nuclear fusion of hydrogen in stars. Helium is named for the Greek Titan of the Sun, Helios. It was first detected as an unknown, yellow spectral line signature in sunlight, during a solar eclipse in 1868 by Georges Rayet, Captain C.