Question: when a lithium atom is made from a helium atom by adding a proton ( and neutron ) to the nucleus and an electron outside,

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 a n=2, l=0, state rather than an n=1, l=0 state. This is an indication that electrons:

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