Which of the following statements are correct?

Options

A. F is the most electronegative and Cs is the most electropositive element
B. The ionization energy of halogens decreases from F to I
C. The electron affinity of Cl is higher than that of F though their electronegativities are in the reverse order
D. The electronegativity of noble gases is almost zero

Answer

A, B, C, D

Explanation

(A) Due to smallest size of F among halogens and due to largest size of Cs among alkali metals
(B) As the size decreases by factor of `n^2` as we go down the group I.E. `downarrow`ses i.e. removal of `e^(-)` becomes easy
(C ) Due to the larger size of Cl as compared to F, gain of `e^(-)` in F causes `e^(-) - e^(-)` repulsion thereby causing difficulty in adding electron.
(D) Self explanatory.