Which element has the highest electronegativity on the Pauling scale?

1. Which element has the highest electronegativity on the Pauling scale? +

Correct Answer

Fluorine (F)
Pauling Electronegativity ≈ 3.98

Detailed Explanation

Electronegativity is the tendency of an atom in a chemical bond to attract the shared electron pair towards itself. On the Pauling scale, fluorine has the highest electronegativity of all elements.

F = 3.98 ≈ 4.0

Fluorine has a very small atomic radius and a high effective nuclear charge. Therefore, it strongly attracts the bonding electron pair.

Why is Fluorine the Most Electronegativity?

There are three major reasons: 1. Small Atomic Size
Fluorine has only two occupied electron shells, so the bonding electrons are very close to the nucleus.

2. High Effective Nuclear Charge
The fluorine nucleus strongly attracts the shared electrons.

3. Relatively Low Shielding
Fluorine has only the 1s core shell shielding its valence electrons.

Small size + High Z_eff → Strong attraction for bonding electrons

Pauling Scale Comparison

Approximate Pauling electronegativities:

F ≈ 3.98  >  O ≈ 3.44  >  N ≈ 3.04  >  C ≈ 2.55

Therefore:

F > O > N > C

Fluorine is therefore the most electronegative element.

JEE / NEET Shortcut

Remember the periodic trend:

Electronegativity ↑ → Left to Right
Electronegativity ↓ → Top to Bottom

The maximum electronegativity occurs near the top-right of the periodic table, with fluorine being the highest.

F → Maximum Electronegativity

Important Comparison

Do not confuse:

• Highest electronegativity: Fluorine (F)
• Most negative electron gain enthalpy: Chlorine (Cl)
• Most electronegative element on Pauling scale: Fluorine (F)

The distinction between fluorine's electronegativity and chlorine's electron gain enthalpy is an important competitive-exam concept.

30 Related MCQs with Solutions

1. Which element has the highest electronegativity?

A. O

B. N

C. F

D. Cl

Answer: C. Fluorine

2. The Pauling electronegativity of fluorine is approximately:

A. 2.55

B. 3.04

C. 3.44

D. 3.98

Answer: D. 3.98

3. Which element is the most electronegative in the periodic table?

A. Chlorine

B. Oxygen

C. Fluorine

D. Nitrogen

Answer: C. Fluorine

4. Which element has the highest electronegativity among halogens?

A. F

B. Cl

C. Br

D. I

Answer: A. F

5. The highest electronegativity is found near which region of the periodic table?

A. Bottom-left

B. Top-right

C. Centre

D. Bottom-centre

Answer: B. Top-right

6. Correct order of electronegativity is:

A. C > N > O > F

B. F > O > N > C

C. N > O > F > C

D. O > N > F > C

Answer: B

7. Why does fluorine have very high electronegativity?

A. Very large atomic radius

B. Small atomic radius and high effective nuclear charge

C. High shielding only

D. Many electron shells

Answer: B

8. Which is more electronegative?

A. F

B. Cl

C. Both equal

D. Br

Answer: A. F

9. Which is more electronegative?

A. O

B. F

C. N

D. C

Answer: B. F

10. Fluorine belongs to which group?

A. 15

B. 16

C. 17

D. 18

Answer: C. Group 17

11. Fluorine belongs to which period?

A. 1

B. 2

C. 3

D. 4

Answer: B. Period 2

12. The electronic configuration of fluorine is:

A. 1s²2s²2p⁵

B. 1s²2s²2p⁶

C. 1s²2s²2p⁴

D. 1s²2s¹2p⁶

Answer: A

13. Which element has a Pauling electronegativity closest to 3.44?

A. C

B. N

C. O

D. F

Answer: C. O

14. Which element has a Pauling electronegativity closest to 3.04?

A. C

B. N

C. O

D. F

Answer: B. N

15. Which element has a Pauling electronegativity closest to 2.55?

A. C

B. N

C. O

D. F

Answer: A. C

16. Electronegativity generally increases:

A. Down a group

B. From left to right across a period

C. From right to left

D. Randomly

Answer: B

17. Electronegativity generally decreases:

A. Across a period

B. Down a group

C. Towards fluorine

D. Towards oxygen

Answer: B

18. Which factor contributes to fluorine's high electronegativity?

A. Large size

B. Small size

C. Large number of shells

D. High shielding

Answer: B

19. Which element is more electronegative than oxygen?

A. C

B. N

C. F

D. B

Answer: C. F

20. Which element has the highest tendency to attract shared electrons?

A. C

B. N

C. O

D. F

Answer: D. F

21. Which element is the most electronegative non-metal?

A. O

B. F

C. Cl

D. N

Answer: B. F

22. The highest electronegativity value on the Pauling scale is approximately:

A. 1.0

B. 2.5

C. 3.0

D. 4.0

Answer: D. Approximately 4.0

23. Which element is closest to the top-right corner among these?

A. Na

B. Mg

C. O

D. F

Answer: D. F

24. Which element has greater effective nuclear attraction for bonding electrons?

A. F

B. Li

C. Na

D. K

Answer: A. F

25. Which statement is correct?

A. F has the lowest electronegativity

B. F has the highest electronegativity

C. Cl has higher electronegativity than F

D. O has higher electronegativity than F

Answer: B

26. Which element has the highest electronegativity among C, N, O and F?

A. C

B. N

C. O

D. F

Answer: D. F

27. Which order is correct?

A. F > Cl > Br > I

B. I > Br > Cl > F

C. Cl > F > Br > I

D. Br > I > F > Cl

Answer: A

28. Which element has the highest electronegativity in Period 2?

A. C

B. N

C. O

D. F

Answer: D. F

29. Which element has the highest Pauling electronegativity?

A. Fluorine

B. Oxygen

C. Chlorine

D. Nitrogen

Answer: A. Fluorine

30. The correct answer to the original question is:

A. Oxygen

B. Nitrogen

C. Fluorine

D. Chlorine

Answer: C. Fluorine

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