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Electron Distribution in Different Orbits

Question 7 Ni...

Question

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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Solution

1. Nitrogen (7): 2, 5
2. Phosphorus (15): 2, 8, 5
3. Since electronegativity decreases down a group, nitrogen will be more electronegative.

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Q. Nitrogen (atomic number

7

) and phosphorus (atomic number

15

) belong to the group

15

of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative and Why?

Q. (a) What were the two major shortcomings of Mendeleev's periodic table? How have these been removed in the modern periodic table?
(b) Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern periodic table do these two elements belong? What type of bond will be formed between them and why?
(c) To which groups of the modern periodic table do the elements X and Y belong? Give reason for your answer.
(d) What could the elements X and Y be? Write their names and symbols.

N (a t o m i c n o .7)

P (a t o m i c n o .15)

belongs to group 15.
Which of them have more electronegativity? Why?

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

Element Atomic number

A 5

B 7

C 10

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

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

The electronic configuration of Phosphorus (atomic number 15) will be:

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