Where did Chemical Substance That Cannot Be Broken Down appear in the Game?

It appeared on Prehistory Group 1253 Puzzle 4

Chemical Substance That Cannot Be Broken Down

CodyCross Chemical Substance That Cannot Be Broken Down Solution

This question is part of CodyCross Prehistory > Group 1253 > Puzzle 4.
Answers of Chemical Substance That Cannot Be Broken Down might change from time to time on each game update.

Chemical Substance That Cannot Be Broken Down

Element

For more CodyCross Prehistory Answers open the previous link.

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