Distncdistance between helium and hydrogen atom at elast energy
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Hydrogen and helium illustrate the fact that not all atoms have the same properties. ... Atoms of hydrogen have a single proton in their center and a single electron in the lowest energy level. Helium atoms, on the other hand, have two protons and two electrons in the lowest energy level.
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hydrogen and helium illustrate the fact that all the elements not have same properties
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