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In a helium atom, which contains two electrons, do you think that on average the electrons are closer to the nucleus or farther away than in a hydrogen atom? Why?
The radius of the orbits in Bohr model are proportional to the charge of the nucleus and in this case the charge would be twice as the one of the hydrogen. Therefore, the radius of the first orbit in the helium atom should be smaller than the one in the hydrogen atom.
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