We’re being asked to determine the subshell in the tin atom that experiences the lowest effective nuclear charge.
Recall that the effective nuclear charge is the force exerted by the nucleus onto an electron. Electrons that are further away from the nucleus have a lower effective nuclear charge. This means the orbital that experiences the greatest Zeff is closest to the nucleus.
A tin atom has 50 electrons. Electrons in the __________ subshell experience the lowest effective nuclear charge.
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