Rare earth metals

1. named after the planet
5. It was discovered in the debris of the first hydrogen bomb explosion in 1952, and named after Enrico Fermi
6. It is named after the city of Berkeley, California
7. named after Greek god of the sky
8. It is named for gadolinite, one of the minerals in which it was found, in turn named for chemist Johan Gadolin.
9. The element was named after the university and the state of California. It is the heaviest element to occur naturally on Earth
12. derived from the name of Titan in Greek mythology who stole fire from Mount Olympus and brought it down to humans
14. named after the Americas
15. named after Nobel laureates
17. Named after a continent
18. Named after the dwarf planet Ceres (itself named after the Roman goddess of agriculture). It is also used in the "flint" (actually ferrocerium) of lighters.

1. is used as a component in the alloys used to make high-strength powerful permanent magnets
2. Named after the inventor of dynamite
3. named after Ytterby, the village in Sweden
4. Named after one of the greatest physicist
10. named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements
11. named after a Russian mine official, Colonel Vasili Samarsky-Bykhovets, who thereby became the first person to have a chemical element named after him
13. Named after Thor, the Norse god of thunder
16. the element was named after the city of Stockholm