alleryStart learning →Which alkali metal has the lowest density of any metal?
ASodium
BPotassium
CCesium
DLithium
Answer & Solution
Correct answer: D. Lithium
1. Alkali metals (group 1) are unusually soft and light compared to most other metals.
2. The text states: "lithium...has the lowest density of any metal (0.5 g/cm3)."
3. This is why lithium famously floats even on paraffin oil, which is itself a low-density liquid.
4. So among the alkali metals -- and among all metals -- lithium has the lowest density.
_Source: OpenStax Chemistry Ch 18 "Representative Metals, Metalloids, and Nonmetals", p.966 §18.1 Periodicity_
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