Lithium (element)
鋰 centers on the chemical element lithium. It is a specialized character used in scientific contexts to name the metal.
鋰 is a modern coined character for the element lithium. It combines 金 (metal) with 里, which likely contributes the sound リ.
The left side 金 means metal, and the right side 里 hints at the sound. Together they point to the metal lithium.
For リ, imagine a lithium battery powering a tiny reed instrument: reed -> リ, and the metal 金 makes it work.