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# Comparing Electron Affinities of Si and P

CHEM-YH7UZJ

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

A

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.

B

Due to electron pair repulsion energy

C

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

D

Because of the stability of half filled shells