question_answer 20)

Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write then-electronic configuration. Which of these will be more electronegative and why?                                

Answer:

The electronic configurations of the two elements are :                Nitrogen (Z = 7) 2,5; Phosphorus (Z = 15) 2, 8, 5                        Nitrogen is more electronegative than phosphorus. The electro negativity decreases down the group with increase in size.