One Carbon Atom and Two Oxygen Atoms: Carbon __
This page is the CodyCross answer for the clue below from Time for a check-up, Group 1702, Puzzle 1 (Physical Exam).
Question is: One Carbon Atom and Two Oxygen Atoms: Carbon __
and the answer is: DIOXIDE
Word Meaning:
DIOXIDE — (chemistry) Any oxide containing two oxygen atoms in each molecule.
Definitions from Wiktionary.