My presence in seawater, on the other hand, is enormous -- approximately 230 billion tones at a constant concentration of 0.1 to 0.2ppm. I am also a part of the crust of your earth: a smaller part in igneous rocks, preferring the granites fro my habitation. You can also find me in clay. I am said to be the earth's 25th most abundant element -- and proud of that fact I am!

It was Arfwedson who found me in Sweden in 1817 and his boss, the pharmacist Berzelisu who christened me. You don't know where to find me most often? Go to South America; the Andes chain -- Chile is the best, followed by Argentina. You might find some of me in Afghanistan, but I am not too sure about that. In the United States, you can track me down in Nevada, otherwise I live in Bolivia and China.

Altogether, people trying to hire me estimate that they can grab about 35 million tones of me. This, my calculator tells me, is enough for approximately 4 billion electric cars.

Although I like myself, I must warn...

Lithium deuteride (a product of myself) was used in early versions of the hydrogen bomb. And -- but details, I warn you, must remain secret (!) -- lithium 6 deuteride still plays a role in modern nuclear weapons. Not many like me, particularly since I have to be handled carefully to avoid skin contact and can cause complications to infants born to women who take me during pregnancy.
On the other hand, do not forget that I am prominently mentioned in the Holy Scriptures. I was included in that Big Bang that created your world. There were only two others (helium and hydrogen) and I in fact. So there! That should be my greatest claim to fame.

References

Greenwood, N.N. & Earnshaw. A. Chemistry of the Elements, Oxford: Pergamon, 1984.

Krebs, R.E. The History and Use of our Earth's Chemical Elements. Conn: Greenwood Press, 2006.

Lide, D.R. CRC Handbook of Chemistry and Physics (86th ed.), Boca Raton (FL): CRC Press, 2005.