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Natomic no.7 ...

Question

$N (a t o m i c n o .7)$ and $P (a t o m i c n o .15)$ belongs to group 15.
Which of them have more electronegativity? Why?

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Solution

shell

K

L

M

Nitrogen

2

5

Phosphorus

2

8

5

Nitrogen is more electronegative than phosphorus. On moving down a group, the number of shell increases. Therefore, the valence electron moves away from the nucleus and the effective nuclear charge decreases.

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Q. 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?

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P o - α - - \to P b - β - \to B i

, if Bi, belongs to group 15, to which Po belongs

The atomic numbers of three elements A, B and C are given below :

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(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

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B	7
C	10

(i) Which element belongs to group 18?
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