Question

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

Lakhmir Singh Chemistry Class 10

Answer 1

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⭐ANSWER : (Checkout the table too... (^^))

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 electro negativity decreases.

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Answer 2

Explanation:

Atomic number of nitrogen is 7 and its electronic configuration is as follows.

                    $1s^{2}2s^{2}2p^{3}$

Atomic number of phosphorous is 15 and its electronic configuration is as follows.

                    $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$

Since both nitrogen and phosphorous are same group elements. Also, it is known that electronegativity decreases on moving down a group. This is due to increase in size of atom down the group as ability to attract an electron by the nucleus of atom decreases as electrons shield the nuclear charge.

Therefore, nitrogen will be more electronegative than phosphorous.