Which atom of P more electronegative, that in PCl3 or that in PCl5? Please explain.

Phosphorous electronegativity is less than that of Chlorine. 
PCl‚Äč3 has 3 Chlorine, in which the three Cl takes away the bond pair electron towards itself making P as P3+, wheras PCl5 
has 5 Chlorine, in which the five Cl takes away the bond pair electron towards itself making P as P5+. So the electronegativity of P3+ > P5+ 
That means PCl3 is more electronegative than PCl5

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