Since this question comes from a man who loves to be tricksie...
'Waht' is spelled what and the 'statement' is not a statement but a question.
Treating the question as a question...
Had to look up the answer because it's way outside my field.
The brief version: not all rare earths are lanthanides.
The long version: Scandium and yttrium are not lanthanides because they have some similar but not exactly the same chemical properties. They are rare earths not because they are uncommon, but because they are difficult to get at or isolate.
Source info for finding the answer:
Definition of lanthanide /ˈlanθənʌɪd/ noun
any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table (atomic numbers 57–71).
from Wikipedia - The17 rare-earth elements are cerium (Ce), dysprosium (Dy), erbium (Er), europium (Eu), gadolinium (Gd), holmium (Ho), lanthanum (La), lutetium (Lu), neodymium (Nd), praseodymium (Pr), promethium (Pm), samarium (Sm), scandium (Sc), terbium (Tb), thulium (Tm), ytterbium (Yb), and yttrium (Y).
This post was edited by inky at January 6, 2020 5:43 AM MST
inky 