Question 7:
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?
Answer:
Nitrogen is more electronegative than phosphorus. On moving down a group, the
number of shell increases. Therefore, the valence electrons move away from the
nucleus and the effective nuclear charge decreases. This causes the decrease in the
tendency to attract electron and hence electronegativity decreases.
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