state gov BSSC Laboratory Assistant Mock Test Series 2025 General Science Chemistry Classification of Elements and Periodicity in Properties
Consider the isoelectronic series:
K+, S2-, Cl- and Ca2+, the radii of the ions decrease as-
1
S2- > Cl- > K+ > Ca2+
2
Ca2+ > K+ > Cl- > S2-
3
Cl- > S2- > K+ > Ca2+
4
K+ > Ca2+ S2- > Cl-