For elements B,C,N,Li,Be,O and F,the correct | vedclass

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Question

(C) The first ionization enthalpy $(I.E._1)$ generally increases across a period from left to right due to an increase in effective nuclear charge.How

Vedclass · Accepted Answer

$Li < B < Be < C < O < N < F$

Vedclass · Answer

(C) The first ionization enthalpy $(I.E._1)$ generally increases across a period from left to right due to an increase in effective nuclear charge.However,there are exceptions due to stable electronic configurations (fully filled or half-filled orbitals).For the given elements in the second period,the order is:$Li (520 \ kJ/mol) $Be$ has a higher $I.E._1$ than $B$ due to its stable $2s^2$ configuration.$N$ has a higher $I.E._1$ than $O$ due to its stable half-filled $2p^3$ configuration.Therefore,the correct order is $Li < B < Be < C < O < N < F$.

For elements $B$,$C$,$N$,$Li$,$Be$,$O$ and $F$,the correct order of first ionization enthalpy is:

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