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Option 2 : Lithium
Option 2 is correct, i.e. Lithium.
- Lithium(Li) is a soft, silvery-white alkali metal, it is the lightest metal and the lightest solid element.Atomic Number is 3.
- Lithium is highly reactive and flame retardant and should be contained in mineral oil.
- It's used in the manufacture of aircraft and in certain batteries. It's also used in mental health: Lithium carbonate is a common treatment of bipolar disorder, helping to stabilize wild mood swings caused by the illness.
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