Jee Main
S Block Elements
JEE Main 2023 (Online) 31st January Evening Shift
INTEGER+4 / -12023
The number of alkali metal(s), from $\mathrm{Li}, \mathrm{K}, \mathrm{Cs}$, Rb having ionization enthalpy greater than $400 \mathrm{~kJ}$ $\mathrm{mol}^{-1}$ and forming stable super oxide is _____________.