Which of the following is the least electronegative basic element?
Cs
Electronegativity generally decreases down a group and increases across a period.
Alkali metals (Group 1) have the lowest electronegativities, and among them Caesium (Cs) has the smallest — approximately 0.79 on the Pauling scale.
Gold, silver, platinum and aluminium/lithium all have higher electronegativity values than Cs.
Hence, Cs.
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