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Ionic radii are [CBSE AIPMT 2004]



A

inversely proportional to effective nuclear charge

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B

inversely proportional to square of effective nuclear charge

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C

directly proportional to effective nuclear charge

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D

directly proportional to square of effective nuclear charge

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Solution

The correct option is B

inversely proportional to effective nuclear charge


Ionic radii1Zeff
Zeff effective nuclear charge.
This Zeff is calculated as follows:
Zeff = Z - screening constant (σ)
This value of screening constant is based upon the number of electrons in valence shell as well as in penultimate shells.


Chemistry

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