Question

Why is the first ionization energy of beryllium higher than that of boron?

Answer 1

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the first ionization energy of beryllium is greater than that of boron because beryllium has a stable complete electronic configuration (1s2 2s2) so it requires more energy to remove the first electron from it. whereas, boron has the electronic configuration ( 1s2 2s2 3s1) which needs lesser energy than that of beryllium to remove the valence electron .

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Answer 2

due to pentration power . beriliyum is 1s2 2s2 , it is completely filled whereas boron is 2p1 ,it is difficult to remove an electron from an completely filled atom therefore ionisation energy of beriliyum is more than boron