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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 electrons in the helium atom are relatively closer than the electron in the hydrogen atom because of the law of attraction and repulsion of charges. In an atom, the nucleus is composed of protons and neutrons which has a net positive charge. Therefore, the nucleus will have a stronger attractive force onto the electrons of the helium atom making it closer.
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