Consider the following:(I) The order of first | vedclass

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(C) Statement $(I)$ is correct: The first ionisation enthalpy order for $Na$ $(1s^2 2s^2 2p^6 3s^1)$,$Mg$ $(1s^2 2s^2 2p^6 3s^2)$,and $Al$ $(1s^2 2s^2

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$I$ & $III$ only

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(C) Statement $(I)$ is correct: The first ionisation enthalpy order for $Na$ $(1s^2 2s^2 2p^6 3s^1)$,$Mg$ $(1s^2 2s^2 2p^6 3s^2)$,and $Al$ $(1s^2 2s^2 2p^6 3s^2 3p^1)$ is $Mg > Al > Na$ due to the stable fully-filled $3s$ orbital in $Mg$.Statement $(II)$ is incorrect: The element with an electronegativity of $3.5$ is oxygen,whereas chlorine has an electronegativity of $3.0$.Statement $(III)$ is correct: These are isoelectronic species with $10$ electrons. For isoelectronic ions,the ionic radius decreases as the nuclear charge $(Z)$ increases. The order of $Z$ is $O^{2-} (8) Statement $(IV)$ is incorrect: The element with atomic number $106$ is seaborgium $(Sg)$,while Bohrium $(Bh)$ has atomic number $107$.

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