.~ Yttrium, lanthanide, actinide, or transactinide containing (i.e., atomic numbers 39 or 57-71 or 89+)
DEFINITION
Classification: 501/152
Yttrium, lanthanide, actinide, or transactinide containing (i.e., atomic numbers 39 or 57-71 or 89+):
(under subclass 1) Subject matter comprising in elemental form or in a compound thereof an element having an atomic number of 39, 57-71, or 89+.
(1) Note. Included herein are compositions including yttrium, lanthanide, actinide, or transactinide elements or compounds of any such elements. Specially included are yttrium, lanthanlum, cerium, praesodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutecium, actinium, thorium, protoactinium, uranium, neptunium, and plutonium.
