Question

which is the least electronegative? k or fr

Explanation:

Step1: Recall the trend of electronegativity in periodic table

Electronegativity decreases down a group in the periodic table. Both \(K\) (Potassium) and \(Fr\) (Francium) belong to Group 1 (alkali metals).

Step2: Compare the positions of \(K\) and \(Fr\)

\(Fr\) is below \(K\) in Group 1. Since electronegativity decreases down a group, \(Fr\) has lower electronegativity than \(K\).

Answer:

\(Fr\)