Light REE’s are made up of the first seven elements of the lanthanide series – Lanthanum (La, atomic number 57), Cerium (Ce, atomic number 58), Praseodymium (Pr, atomic number 59), Neodymium ...

atomic number 68), Thulium (Tm, atomic number 69), Ytterbium (Yb, atomic number 70) and Lutetium (Lu, atomic number 71). REEs with even atomic numbers have greater abundance than their odd ...

Pekka Pyykkö proposes a periodic table that goes all the way up to atomic number 172 and is based on electronic configurations, which he calculated by taking relativistic effects into account.