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Which one of the following ions has the highest value of ionic radius ?                               [AIEEE-2004]
  • a)
    O2-
  • b)
    B3+ 
  • c)
    Li+ 
  • d)
    F-
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Which one of the following ions has the highest value of ionic radius ...
This can be explained on the basis of z/e, where as z/e ratio increases, the size decreases and when z/e ratio decreases the size increases.
z is atomic number and e is number of electrons.
For Li+, z/e = 3/2 = 1.5
For F-, z/e = 9/10 = 0.9
For O2-, z/e = 8/10 = 0.8
For B3+, z/e = 5/2 = 2.5
The correct option is A.
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Most Upvoted Answer
Which one of the following ions has the highest value of ionic radius ...
The ionic radius of negative ion in greater than positive ion. Thus ionic radius order is B+³
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Which one of the following ions has the highest value of ionic radius ...

Explanation:

Definition of ionic radius:
Ionic radius is defined as the radius of an ion in an ionic compound.

Factors affecting ionic radius:
1. Number of electron shells: More the number of electron shells, larger the ionic radius.
2. Nuclear charge: Greater the nuclear charge, smaller the ionic radius.
3. Electron-electron repulsions: Repulsions between electrons in the same shell cause the ionic radius to increase.

Comparison of ions:
- O2- ion has the highest value of ionic radius among the given options.
- O2- has 10 electrons and a charge of -2. Due to the addition of two extra electrons, the electron-electron repulsions increase, causing the ionic radius to increase.
- B3+ has 3 electrons and a charge of +3, resulting in a smaller ionic radius due to the higher nuclear charge.
- Li+ has 3 electrons and a charge of +1, leading to a smaller ionic radius compared to O2-.
- F- has 10 electrons and a charge of -1, but the ionic radius of F- is smaller than O2- due to the higher nuclear charge of fluorine.

Therefore, O2- ion has the highest value of ionic radius among the given ions due to the electron-electron repulsions caused by the addition of extra electrons.
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Which one of the following ions has the highest value of ionic radius ? [AIEEE-2004]a)O2-b)B3+c)Li+d)F-Correct answer is option 'A'. Can you explain this answer?
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