Rb Is the Chemical Symbol for This

This page is the CodyCross answer for the clue below from Inside the Spaceship, Group 1199, Puzzle 3 (Themed Packs).

Question is: Rb Is the Chemical Symbol for This

and the answer is: RUBIDIUM

Word Meaning:

RUBIDIUM — (uncountable) The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.

Definitions from Wiktionary.

Rb is the chemical symbol for this — CodyCross Answer | CodyCross Solutions