Name: the densest liquid and the lightest; lightest metal; the densest gas and the lightest.

The liquid with the highest density: mercury (Hg) ρ = 13600 kg / m ^ 3.
The liquid with the lowest density: gasoline ρ = 710 kg / m ^ 3.
The lightest metal: lithium (Li) ρ = 534 kg / m ^ 3.
The densest gas: chlorine (Cl) ρ = 3.21 kg / m ^ 3.
The lightest gas: hydrogen (H2) ρ = 0.009 kg / m ^ 3.



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