Which of the following statements are correct? A. The process of the addition an electron to a neutral gaseous atom is always exothermic B. The process of removing an electron from an isolated gaseous

Question

Which of the following statements are correct?
A. The process of the addition an electron to a neutral gaseous atom is always exothermic
B. The process of removing an electron from an isolated gaseous atom is always endothermic
C. The $1^{st}$ ionization energy of the boron is less than that of the beryllium
D. The electronegativity of C is 2.5 in $CH_{4}$ and $CCl_{4}$
E. Li is the most electropositive among elements of group I
Choose the correct answer from the options gives below

TestHub · Accepted Answer

(A) The process of adding an e − to a neutral gaseous atom is not always exothermic it may be exothermic or endothermic. (C) Be B 1 s 2 2 s 2 1 s 2 2 s 2 2 p 1 In Be 2 s subshell in fully filled So, need high energy to remove e − as compared to B. (D) due to partially positive charge z eff ​ ↑ , EN ↑ So, EN of C ⇒ CCl 4 ​ > CH 4 ​ (E) Cs is most electropositive.

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