It Puts the H in H2O
This page is the CodyCross answer for the clue below from Singapore, Group 2023, Puzzle 4 (Botanic Gardens).
Question
It Puts the H in H2O
Answer
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.