Most Abundant Chemical Substance in the Universe

This page is the CodyCross answer for the clue below from Train Travel, Group 705, Puzzle 1 (Folding Seats).

Question is: Most Abundant Chemical Substance in the Universe

and the answer is: HYDROGEN

Word Meaning:

HYDROGEN — (uncountable) The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.

Definitions from Wiktionary.

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