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The shielding of electrons gives rise to an effective nuclear charge, Z eff which explains why boron is larger than oxygen. Estimate the approximate Z eff felt by a valence electron of boron and oxygen, respectively? Please explain (I don't want just the answer).
A. +5 and +8B. +3 and +6C. +5 and +6D. +3 and +8E. +1 and +4
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