Discussion
Which of the following is the lightest metal?
Answer: D
The lightest metal is Lithium.
Lithium has a density of about 0.53 g/cm3, roughly half that of water, so it floats on water (and oil). It is the lightest of all metals and of all solid elements, which is why it is used in light rechargeable batteries.
Magnesium (about 1.74 g/cm3) and aluminium (about 2.7) are light structural metals, but much denser than lithium. Platinum (about 21.4) is among the densest metals.
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