Choose the Best Answer · Q8
Q.Identify the wrong statement.
(a) Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius
(b) Amongst isoelectronic species greater the negative charge on the anion, larger is the ionic radius
(c) Atomic radius of the elements increases as one moves down the first group of the periodic table
(d) Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.
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Start your 14-day free trial to unlock the full solution →Step 1. For a series of isoelectronic ions (same electron count, different nuclear charge), more protons pull the same electron cloud in tighter, so radius shrinks as positive charge increases -- meaning a smaller positive charge gives a larger, not smaller, radius. Statement (a) claims the opposite, so it is wrong.
Step 2. Statement (b): for isoelectronic anions, a greater negative charge means more electrons crowded into the same-size shell with the same nuclear pull, so more electron-electron repulsion and a larger radius -- this is correctly stated. …
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