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Helium (He) has an atomic number of 2. It is colorless, odorless, tasteless, non-toxic, inert, monatomic, and heads the noble gas group. Its boiling and melting points are among the lowest of all elements and exists only as a gas. It is the second lightest element and the second most abundant element in the universe. Helium-4 has a very high nuclear binding energy and therefore is a product of nuclear fuson and radioactive decay.It is named after the Greek god of the sun, Helios, because it was first detected during a solar eclipse.

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