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Why does silicon have a larger (more negative) electron affinity than phosphorous?


Because as the general trend states: Along a period the radius of the elements get smaller and the positive charge in the nucleus ( number of protons) increases resulting in an increase of the electron affinity.


Due to electron pair repulsion energy


Because there are two empty 3p orbitals in Si and only one empty 3p orbital in P.


Because of the stability of half filled shells

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