The Lightest of the Alkali Metals
This page is the CodyCross answer for the clue below from Inside the Spaceship, Group 1184, Puzzle 4 (The Big Apple).
Question is: The Lightest of the Alkali Metals
and the answer is: LITHIUM
Word Meaning:
LITHIUM — (uncountable) The simplest alkali metal, the lightest solid element, and the third lightest chemical element (symbol Li) with an atomic number of 3 and atomic weight of 6.94. It is a soft, silvery metal.
Definitions from Wiktionary.