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@NickV5 #16
lithium, or some other heavy metal.

Lithium, a heavy metal, IIRC it comes right after H (1) and He (2).

Li (3) has an atomic weight of only 6.941, I had to look that up, I must be getting old. Hummm I am only 72, ouch, that is old. At least I remembered Li was #3 after H and He.

No I was not a chemist.