Q. 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
Explanation
[Solution from source] In an isoelectronic series, a larger positive charge pulls the same number of electrons more strongly and gives a smaller radius; so a smaller positive charge gives a larger, not smaller, radius. The other statements are correct: radius decreases across a period, increases down a group, and increases with greater negative charge. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.