Question

The pair of elements that form the most ionic compound among the following is:

• A. $Na$ and $Cl$
• B. $Be$ and $Cl$
• C. $B$ and $Si$
• D. $Ag$ and $Cl$

Answer 1

The correct option is A $Na$ and $Cl$

An ionic compound will be formed between the elements in which one of the element has a low ionization energy and the other has a high electron affinity. Among the given pairs, $Na$ has the lowest ionization energy and $Cl$ has the highest electron affinity. Hence, the compound formed between them will be the most ionic.