Chemistry, 28.12.2019 05:31, carmenala2
The shielding of electrons gives rise to an effective nuclear charge, z_{\rm eff}, which explains why boron is larger than oxygen. estimate the approximate z_{\rm eff} felt by a valence electron of boron and oxygen, respectively?
a. +5 and +8
b. +3 and +6
c. +5 and +6
d. +3 and +8
e. +1 and +4
Answers: 1
is estimated by subtracting the core electrons from the atomic number of the element. 
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