Q. Which of the following is the largest is size?

 3171  204 J & K CETJ & K CET 2011Classification of Elements and Periodicity in Properties Report Error

Solution:

and are isoelectronic species (containing equal number of electrons, i.e., ). Their radii would be different because of their different nuclear charge. Anion with the greater negative charge will have the larger radius hence has larger size than . For isoelectronic species, radii Further and are also isoelectronic species but they have electrons. Hence, their sizes are smaller than ion.