The observed general trend in ionization energies shows two slight discontinuities in each period. Examine the electron configuration at these points and explain why such a discontinuity may occur.

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  1. kn;lm';/;l,'/;,

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  2. Look at the electron configurations for example One of the discontinuities happen from Be to B and the other from N to O
    In both these situations
    Be and N were in a stable position ( full orbital or half full orbitals)
    So they need more energy to go to next level
    therefore, they lost some energy and their energy level went lower.

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