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Helium-2 would refer to an isotope of helium with a nucleus consisting of just two protons and having two orbital electrons.
However, no such atom exists in nature as the two positively charged protons repel each other more strongly than the nuclear strong force attracts them to each other. So, even if such a nucleus could be formed somehow, it would split apart very quickly.
On the other hand, if you add a neutron to the two protons in the nucleus, then the nuclear strong force is sufficient to keep the protons from flying apart. This, together with two orbiting electrons, is the stable helium-3 atom. The most common isotope of helium is helium-4, with two protons and two neutrons in the nucleus, and two orbital electrons.
What else can I help you with?
What are the answers for the element challenge puzzle?
Down1)helium2)Barium4)lithium6)phosphorous9)Krypton10)Beryllium12)magnesium14)Carbon18)mercury19)hydrogen20)potassium22)lead25)tungsten27)manganese28)zinc29)chromium30)bismuth31)cesium33)copper34)iron38)gold39)tinACROSS3)fluorine5)calcium7)platinum8)iodine10)boron11)nickel13)aluminum14)cobalt15)uranium16)neon17)sulfur21)silver23)oxygen24)silicon26)cadmium30)bromine32)argon35)antimony36)sodium37)nitrogen40)chlorineThese may or may not be correct.
What is the 5th noble gas?
Radon, Rn
