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Which element has the lowest density among solids at room temperature?
ChemistryElements
Quick Answer
Lithium is the least dense solid element at room temperature, with a density of about 0.53 g/cm³. It is so light that it floats on water, although it reacts with water at the same time.
The Full Story
Lithium is the lightest solid element under normal conditions, with a density around 0.53 grams per cubic centimeter. That makes it lighter than most woods and much lighter than common metals such as aluminum, iron, or copper. Because it is highly reactive, lithium is stored under oil and rarely handled in open air. It is especially important in rechargeable batteries, where its low atomic mass helps deliver high energy density.
Key Facts
1.Lithium density: about 0.53 g/cm³
2.Atomic number: 3
3.Key use: lithium-ion batteries
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"The lightest metal you can hold"