Question

compare ionisation energy of beryllium and boron​

Answer 1

Answer:

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According to periodic trends, boron should have a higher ionization energy but because its valence electron (2p1) is shielded by the 2s electrons, less energy is required to remove the 2p electron(s) from a boron atom than is requried to remove the 2s electron from a beryllium atom.

Answer 2

Answer:

The ionisation energy of Boron is less than that of Beryllium.

Explanation:

Because in Boron there is a complete 2s orbital. The increased shielding of the 2s orbital reduces the ionisation energy. Similarly, the I.E. of Oxygen is less than that of Nitrogen because the extra electron is shielded by the half-filled 2p orbital.