Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?

The atomic number of Nitrogen is 7, Electronic configuration of Nitrogen is 1s²,2s²,2p³

The atomic number of Phosphorus is 15 , Electronic configuration of Phosphorous is 1s²,2s²,2p⁶,3s²,3p³

On moving top to bottom a group in the periodic table, the number of shells increases. Due to this, valence electrons move away from the electrons and the effective nuclear charge (Z*) decreases. This causes a decrease in the tendency to attract electrons and hence electronegativity decreases. Because of all these reasons, Nitrogen is more electronegative than phosphorus.