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  • Among the following ionic radii, choose the correct option:Option: 1 K+ > Cl-<div class='q

Among the following ionic radii, choose the correct option:

Option: 1

K+ > Cl-


Option: 2

Na < Na+


Option: 3

Cl > Cl-


Option: 4

P3+ > P5+


Answers (1)

best_answer

Variation of Atomic Radii and ionic radii -

Comparison of the ionic radii and atomic radii

Variation in a Group

In moving from top to bottom in a group, the number of shells increases due to which the atomic size increases. 

  • The size of the cation is always smaller than its parent atom. In the case of cations, the number of electrons in the ion decrease and the nuclear charge remains the same, thus the effective nuclear charge increases and the size decreases.

  • Thus, the size of cation ∝ 1/Zeff 

  • M+3 < M+2 < M+ < M 

  • The size of the anion is always greater than its parent atom. In the case of anions, the number of electrons in the ion increase and the nuclear charge remain the same, thus the effective nuclear charge decreases and the size increases.

  • Thus, size of anion ∝ 1/Zeff 

  • M-3 > M-2 > M- > M

-

The size of cation is always lesser than the atom and the size of anion is always is greater than the atom. Again, more positively charged cation is smaller in size than less positively charged cation.

Therefore, Option(4) is correct

Posted by

Deependra Verma

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