Lithium
/lˈɪθiəm/
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Definition
(noun) The simplest alkali metal, the lightest solid element, and the third lightest chemical element (symbol Li) with an atomic number of 3 and atomic weight of 6.94. It is a soft, silvery metal.
Sentence Examples
Lithium, sodium, potassium, rubidium, caesium and francium are alkali metals.
The lithium coin memory back-up battery inside this product contains Perchlorate.
CEFR Practice Quiz
____ is a soft and silvery-white alkali metal that is commonly used in rechargeable batteries today.