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.
Both 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
The 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.)
Both helium-3 and helium-4 are stable, and neither will spontaneously undergo nuclear change.
Helium 4.
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Helium3's weight would be 3 grams!!!!!! Look on the periodic table if you don't believe me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
helium3
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