The first ionization enthalpies of Li,Be,and | vedclass

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(A) The correct value is $800 \ kJ \ mol^{-1}$.In the second period,the ionization enthalpy increases from $Li$ to $Ne$ with some exceptions.Specifica

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$800 \ kJ \ mol^{-1}$

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(A) The correct value is $800 \ kJ \ mol^{-1}$.In the second period,the ionization enthalpy increases from $Li$ to $Ne$ with some exceptions.Specifically,$Be$ $(1s^2 2s^2)$ has a higher ionization enthalpy than $B$ $(1s^2 2s^2 2p^1)$ because $Be$ has a stable fully-filled $2s$ orbital.Therefore,the order of first ionization enthalpy for these elements is $Li Since $B$ must be lower than $Be$ $(899 \ kJ \ mol^{-1})$,$800 \ kJ \ mol^{-1}$ is the appropriate value.

The first ionization enthalpies of $Li$,$Be$,and $C$ are $520$,$899$,and $1086 \ kJ \ mol^{-1}$ respectively. Which of the values $800$ or $900 \ kJ \ mol^{-1}$ is more likely for the first ionization enthalpy of $B$? Why?

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