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Helium is a noble gas (group 18 element) and has two valence electrons (stable electronic configuration) and is chemically inert. Oxygen belongs to group 16 with 6 valence electrons and is reactive element.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoBoth have two protons in the nucleus, He-3 has one neutron and He-4 has two. Both are stable nuclei. He-3 is found in natural helium on earth, but only about 0.00013 percent. It may be more common on the Moon (speculation). See link below
Wiki User
∙ 11y agoThe only difference is the number of neutrons in each nucleus: Helium 4 has two neutrons in each nucleus while helium 3 has only one neutron in each nucleus. (Both isotopes have two protons in each nucleus.)
Wiki User
∙ 13y agoBoth helium-3 and helium-4 are stable, and neither will spontaneously undergo nuclear change.
Wiki User
∙ 13y agoHelium 4.
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