Question

Nitrogen (atomic number-7) and Phosphorus (atomic

number-15) belong to group -15 of the modern periodic table.

(i) Write the electronic configuration of these two elements.

(ii) Which of these will be more electro negative and why?​

Answer 1

Answer:

Nitrogen atomic number is 7

so N7= 1s2 2s2 2P3

and for phosphorus it will [Ne] 3s2 3p 3

Explanation:

Due to its small size, the net electron charge increases. Hence, its nucleus exerts greater force on the electrons. Thetefore, its tendency to gain electron is more as compared to that of Phosphorus. That is the reason why, Nitrogen is more electronegative element than Phosphorus.

Answer 2

Answer:

The electronic configurations of the two elements are nitrogen (Z = 7) 2, 5; Phosphorus (Z = 15) 2,8, 5.

Since the size of nitrogen is small as compared to phosphorus, it has a greater tendency to take up electrons. It is therefore, more electro-negative than phosphorus.