Statement I: Metallic character decreases from left to right across a period and increases down a group. K (Group 1, Period 4) is the most metallic element among these. Mg (Group 2, Period 3) is less metallic than K. Al (Group 13, Period 3) is less metallic than Mg. B (Group 13, Period 2) is a metalloid with the least metallic character. The order K > Mg > Al > B correctly represents decreasing metallic character. TRUE.
Statement II: Atomic radius compared to ionic radius depends on whether the ion is a cation or anion. For metals forming cations: atomic radius > cationic radius (e.g., Na > Na⁺). However, for nonmetals forming anions: atomic radius < anionic radius (e.g., Cl < Cl⁻). The statement claims atomic radius is ALWAYS greater for ANY element, which is incorrect because anions have larger radii than their parent atoms. FALSE.
Correct answer: Statement I is true but Statement II is false.