The number of alkali metal(s),from Li,K,Cs,Rb | vedclass

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Question

(C) The ionization enthalpies of the given alkali metals are: $Li \approx 520 \ kJ \ mol^{-1}$,$K \approx 419 \ kJ \ mol^{-1}$,$Rb \approx 403 \ kJ \

Vedclass · Accepted Answer

$2$

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(C) The ionization enthalpies of the given alkali metals are: $Li \approx 520 \ kJ \ mol^{-1}$,$K \approx 419 \ kJ \ mol^{-1}$,$Rb \approx 403 \ kJ \ mol^{-1}$,and $Cs \approx 376 \ kJ \ mol^{-1}$.Among these,$Li$,$K$,and $Rb$ have ionization enthalpy greater than $400 \ kJ \ mol^{-1}$.Regarding the formation of stable superoxides $(MO_2)$,only the larger alkali metals $K$,$Rb$,and $Cs$ form stable superoxides.Comparing both conditions,only $K$ and $Rb$ satisfy both criteria (ionization enthalpy $> 400 \ kJ \ mol^{-1}$ and formation of stable superoxide).Therefore,the number of such metals is $2$.

The number of alkali metal$(s)$,from $Li$,$K$,$Cs$,$Rb$ having ionization enthalpy greater than $400 \ kJ \ mol^{-1}$ and forming stable super oxide is $.......$

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