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Helium
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| style="height:20px; width:200px; text-align:center;" colspan = "2"|[[Helium]] always has 2 [[proton]]s. The most [[Stable Isotope|stable]] [[isotope]] has 2 [[neutron]]s.
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==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=hLUcO26Q7wE}}