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Identify the wrong statement in the following:
A
Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table
B
Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
C
Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
D
Atomic radius of the elements increases as one moves down the first group of the periodic table
Detailed Solution
For isoelectronic species, a greater positive charge means a greater effective nuclear charge and a smaller radius.
So a smaller positive charge on the cation gives a larger, not smaller, ionic radius (e.g. $Na^+ > Mg^{2+} > Al^{3+}$).
The other three statements are correct, so this statement is wrong.
So a smaller positive charge on the cation gives a larger, not smaller, ionic radius (e.g. $Na^+ > Mg^{2+} > Al^{3+}$).
The other three statements are correct, so this statement is wrong.