Atomic and ionic radii
- The element expected to form largest ion to achieve the nearest noble gas configuration is : Answer: 4. N Key idea: For isoelectronic ions (all 10 electrons), the one with the lowest nuclear charge is the largest. The ions are Na^+ (... 1
- From the following pairs of ions which one is not an iso-electronic pair ? Answer: 4. Fe²⁺, Mn²⁺ Key idea: iso-electronic species have the same number of electrons. mathrmO²⁻ (10) and F^- (10): yes Na^+ (10) and mat... 1
- The correct order of atomic radii in group 13 elements is Answer: 4. B < Ga < Al < In < Tl Atomic radius generally increases down a group, but Ga is smaller than Al. Gallium follows the d-block (3d)... 1