Which of the following statements are correct | vedclass

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Question

(A) Incorrect: The process of adding an $e^-$ to a neutral gaseous atom is not always exothermic; it can be endothermic for elements like noble gases

Vedclass · Accepted Answer

$B$ and $C$ only

Vedclass · Answer

(A) Incorrect: The process of adding an $e^-$ to a neutral gaseous atom is not always exothermic; it can be endothermic for elements like noble gases or nitrogen.$(B)$ Correct: Removing an electron requires energy to overcome the electrostatic attraction between the nucleus and the electron,making it always endothermic.$(C)$ Correct: $Be$ $(1s^2 2s^2)$ has a fully filled $2s$ subshell,which is more stable than $B$ $(1s^2 2s^2 2p^1)$. Thus,the $1^{st}$ ionization energy of $Be > B$.$(D)$ Incorrect: Electronegativity is not a constant value; it depends on the oxidation state and hybridization. In $CCl_4$,the carbon atom is bonded to highly electronegative $Cl$ atoms,which increases its effective nuclear charge and thus its electronegativity compared to $C$ in $CH_4$.$(E)$ Incorrect: Electropositive character increases down the group. $Cs$ is the most electropositive element in group $I$.Therefore,only statements $B$ and $C$ are correct.

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