Reactive, Soft Alkali Metal, Symbol Rb

This page is the CodyCross answer for the clue below from London, Group 496, Puzzle 4 (Naomi Campbell).

Question is: Reactive, Soft Alkali Metal, Symbol Rb

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.

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