(1) $\mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{Mg}^{2+}>\mathrm{Be}^{2+}$

(2) $\mathrm{Mg}^{2+}>\mathrm{Be}^{2+}>\mathrm{Li}^{+}>\mathrm{Na}^{+}$

(3) $\mathrm{Li}^{+}>\mathrm{Be}^{2+}>\mathrm{Na}^{+}>\mathrm{Mg}^{2+}$

(4) $\mathrm{Na}^{+}>\mathrm{Li}^{+}>\mathrm{Mg}^{2+}>\mathrm{Be}^{2+}$

[AIEEE 2009]

(1) I > Br > Cl > F

(2) F > Cl > Br > I

(3) Cl > F > Br > I

(4) Br > Cl > I > F

[AIEEE 2011]

(1) $\mathrm{K}^{+}, \mathrm{S}^{2-}, \mathrm{Ca}^{2+}, \mathrm{Cl}^{-}$

(2) $\mathrm{Cl}^{-}, \mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{S}^{2-}$

(3) $\mathrm{S}^{2-}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+}, \mathrm{K}^{+}$

(4) $\mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{S}^{2-}$

[AIEEE 2012]

(1) Ca < S < Ba < Se < Ar

(2) S < Se < Ca < Ba < Ar

(3) Ba < Ca < Se < S < Ar

(4) Ca < Ba S < Se < Ar

[JEE-Main 2013]

(1) – 2.55 eV

(2) – 5.1 eV

(3) – 10.2 eV

(4) + 2.55 eV

[JEE-Main 2013]

(1) Smaller size of chlorine atom

(2) Bigger size of 2p orbital of fluorine

(3) High ionization enthalpy ol fluorine

(4) Smaller size of fluorine atom

[JEE-MAIN 2013 (OnLine)]

(1) As < S < O < Se

(2) O < S < As < Se

(3) Se < S < As < O

(4) O < S < Se < As

[JEE-MAIN 2013 (OnLine)]

(1) O > F > N > C

(2) O > N > F > C

(3) C > N > O > F

(4) F > O > N > C

[JEE-MAIN 2013 (OnLine)]

[JEE-MAIN 2014 (OnLine)]

(1) Sc

(2) Rb

(3) Na

(4) K

[JEE-MAIN 2016]

(1) $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$

(2) $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{+}$

(3) $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{2+}$

(4) $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$

[JEE-MAIN 2017]