Which of the following is the Lightest Metal?
Answer: (2) Lithium
Lithium is the lightest Metal. It is a chemical element and it is an alkali metal. It was discovered by Johan August Arfwedon in 1817.
Atomic number 3
Atomic weight 6.94
Boiling point 1330oC
It is soft enough to be cut with a knife. It has a very low density of 0.534 g/cm3. It is made by electrolysis of fused lithium chloride.