There Are Two Atoms of This in a Water Molecule

This page is the CodyCross answer for the clue below from Cosmetology, Group 1765, Puzzle 2 (Copper Peptides).

Question is: There Are Two Atoms of This in a Water Molecule

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.

There are two atoms of this in a water molecule — CodyCross Answer | CodyCross Solutions