Question

On the basis of electronegativity, which pair of elements is most likely to form monatomic ions? responses a. Ba and O b. Cs and Rb c. O and F d. Na and K

Answer 1

On the basis of electronegativity, elements that are far apart on the periodic table are more likely to form monatomic ions. This is because the larger the electronegativity difference between two elements, the more likely it is for one element to gain or lose electrons to achieve a stable electron configuration.

Out of the given options, the pair of elements that are the farthest apart on the periodic table is option d. Na (sodium) and K (potassium). Both sodium and potassium are in Group 1 (alkali metals), but potassium is located one period below sodium, making it more likely to form a monatomic ion due to the larger electronegativity difference.

Therefore, the answer is d. Na and K.