The first lanthanide is lanthanum
Periodically number fifty seven
The 4-F electron shell characterizes
Almost every lanthanide

With Mischmetal I'm in lighter flints
And Infrared camera and telescope lenses
Discovered in 1839 by Carl Gustav Mosander
Lanthanum's used for mantels in gas powered lanterns

Lanthanum ... Catalysts crack Petroleum ...
Into useful products like gasoline ... and reacts directly with the halogens
And Carbon, Nitrogen, Boron, Selenium, Silicon, Phosphorus, and Sulphur

My brinell hardness is 363 mega pascals
In vacuum tubes I am a hot cathode material
Strong emissivity for scanning electron microscopes
And high intensity lighting in film studios

Lanthanum ... Catalysts crack Petroleum ...
Into useful products like gasoline ... and reacts directly with the halogens
Lanthanum ... Catalysts crack Petroleum ...
Into useful products like gasoline ... and reacts directly with the halogens
And Carbon, Nitrogen, Boron, Selenium, Silicon, Phosphorus, and Sulphur

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