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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 +8
B. +3 and +6
C. +5 and +6
D. +3 and +8
E. +1 and +4

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