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The two metals with the lowest Mohs hardness scale values are cesium, with hardness 0.2, and rubidium, with hardness 0.3. Lithium, sodium, and potassium metals have values near 0.5-0.6.

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Cesium and rubidium are liquids at or near room temperature--cesium undergoes phase change at 28C, rubidium undergoes phase change at 39C. I knew they were the softest metals on the Mohs scale, but didn't list them because of this low melt point.

So...after the liquid metals (there are five--Mercury, francium and gallium plus the two already named), you could pick any of the three low-mass alkali metals as the "softest."

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15y ago

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