A) 8.29, 9.32
B) 9.32, 9.32
C) 8.29, 8.29
D) 9.32, 8.29
Correct Answer: D
Solution :
First ionisation potential of Be (completely filled orbital) is greater than boron due to stable configuration \[_{4}Be=1{{s}^{2}},\,\,2{{s}^{2}}\] \[_{5}B=1{{s}^{2}},\,\,2{{s}^{2}}2{{p}^{1}}\] Order of attraction of electrons towards nucleus 2s > 2p, so more amount of energy is required to remove the electron with 2s-orbital in comparison to 2porbital. So ionisation potential of Be is 9.32 eV and B is 8.29 eV.
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