Helium is a gas. It is found in traces in the Earth's atmosphere.
Hydrogen and helium, the most common elements in the Universe.Hydrogen and helium, the most common elements in the Universe.Hydrogen and helium, the most common elements in the Universe.Hydrogen and helium, the most common elements in the Universe.
Hydrogen and helium, the most common elements in the Universe.Hydrogen and helium, the most common elements in the Universe.Hydrogen and helium, the most common elements in the Universe.Hydrogen and helium, the most common elements in the Universe.
There are several isotopes of Helium and they have different numbers of neutrons. The simplest and most common is Helium-4 which has two neutrons
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They are not, the most common elements are Hydrogen and Helium.
Hydrogen, helium.
helium is a gas and is found only in the earth's atmosphere
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Stars contain hydrogen, helium and a little iron.
Hydrogen and helium.
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