Possible Clues:

• Element of the lanthanide series
• One of a particular group of metallic elements
• Terbium, e.g.
• Promethium's element class
• Oxide, not often found on our planet
• Oxide of cerium, yttrium, etc.
• Particular element that's thin on the ground
• An oxide seldom found on land
• She was hailed as the first R and B vocalist on the Murder Inc label
• Old show for old king (not original) from 57 to 71 in the table