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:

i) nitrogen : 2,5 or 2+5

phosphorus : 2,8,5 or 2+8+5

ii) nitrogen, as it has a greater tendency to attract electrons in a bond, as it has fewer shells...so positive nucleus is closer to the outer shell...so attracts electrons more strongly...

hope u get that :)

Answer 2

Answer:

(i) a) Nitrogen (7): 2, 5 (OR) 1s², 2s², 2p³

   b) Phosphorus (15): 2, 8, 5 (OR) 1s², 2s², 2p⁶, 3s², 3p³

(ii) Nitrogen is more electronegative than Phosphorus.

From top to bottom down a group, electronegativity decreases. This is because number of shell increases down a group, and thus there is an increased distance between the valence electrons and nucleus, or a greater atomic radius.

Hope this helps you :)