COMPOUND CONTAINS TWO OR MORE HEAVY METAL ATOMS WHICH ARE INDIFFERENT GROUPS OF THE PERIODIC SYSTEM (19/00; 19/00B):
(under the class definition) Subject matter wherein the compound contains at least two different heavy metal atoms which are in different groups of the Periodic System.
(1) Note. For purposes of this subclass, the lanthanides (atomic numbers 57-71) are to be considered as a whole to be in one group and the actinides (atomic numbers 89 and above)
are to be considered as a whole to be in a separate group. Examples of appropriate placement in this subclass would be a compound that contained both Fe (Group 8) and As (Group 5) or a compound containing both Fe (Group 7) and any actinide or lantinide atom.
(2) Note. A heavy metal is defined as a metal having a specific gravity greater than four.
(3) Note. Excluded as heavy metals are the Group 1A and Group 2A metals, with the exception of Ra. Also, excluded are Al and Sc. Arsenic is considered to be a heavy metal atom in Group 5.
(4) Note. See the Class 502 schedule (Catalyst, Solid Sorbent, or Support Therefor: Product or Process of Making) for a grouping of metal atoms into the appropriate groups of the Periodic System.
