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Identify the wrong statement in the following:

1. Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
2. Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
3. Atomic radius of the elements increases as one moves down the first group of the periodic table
4. Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table

Correct answer: Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius

Solution

Option A is incorrect because for isoelectronic species, the smaller the positive charge on the cation, the larger the ionic radius, not smaller. This is due to reduced nuclear attraction on the same number of electrons.

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