The Weakest Metal in the World

There isn’t a single universally agreed “weakest metal,” because weakness depends on the property you mean: softness, tensile strength, hardness, or metallic bonding. In many references, mercury is often cited as the weakest in terms of metallic bonding, while lead, tin, or sodium are commonly named when talking about low mechanical strength or softness

Most common answers
Mercury: often described as having the weakest metallic bonding and very low melting point, which is why it is liquid at room temperature.

Lead or tin: often cited as among the weakest by tensile strength or general mechanical weakness
Sodium or cesium: sometimes mentioned when the focus is extreme softness or low shear resistance

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