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When a lithium atom is made from a helium atom by adding a proton (and neutron) to the nucleus and an electron outside, the electron goes into an n = 2, = 0 state rather than an n = 1, = 0 state. This is an indication that electrons:

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When a lithium atom is made from a helium atom by adding a proton (and neutron) to the nucleus and an electron outside, the electron goes into an n = 2, = 0 state rather than an n = 1, = 0 state. This is an indication that electrons:






 
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