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He 4 refers to helium-4, a stable isotope of helium with two protons and two neutrons. It is the most common form of helium, making up about 99.99986% of naturally occurring helium. Helium-4 is significant in various scientific fields, including quantum mechanics and astrophysics, where it plays a role in nuclear fusion processes in stars. Additionally, it is used in cryogenics and as a lifting gas in balloons.

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AnswerBot

2w ago

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