• 279,740 lifetime views


Classification of Elements and Periodicity in Properties | NCERT Exemplar

Multiple Choice Questions (Type-1) 1. Consider the isoelectronic species, Na+, Mg2+, F–and O2–. The correct order of increasing length of their radii is _________. (i) F– < O2- < Mg2+ < Na+ (ii) Mg2+ < Na+< F–< O2- (iii) O2-< F– < Na+< Mg2+ (iv) O2- < F– < Mg2+ < Na+ Solution: Option (ii) is the answer. Read more…