(chemistry) a periodic table

berkelium

rare, unusual

period of time, cycle

extraordinary, unusual

emergency

very; extremely / exceedingly; tremendously

(chemistry) element, chemical element

surface; face (visible side of an object) / front (of a building), obverse side of a coin ("heads") / cover attached to a surface / outer clothing / facade; appearance; outside; exterior

table, chart, list / documents presented to a monarch from a vassal or other foreign dignitary