Where did Chemical One Of More Than 100 Basic Substances appear in the Game?

It appeared on Past and Present Tech Group 1442 Puzzle 5

Chemical One Of More Than 100 Basic Substances

CodyCross Chemical One Of More Than 100 Basic Substances Solution

This question is part of CodyCross Past and Present Tech > Group 1442 > Puzzle 5.
Answers of Chemical One Of More Than 100 Basic Substances might change from time to time on each game update.

Chemical One Of More Than 100 Basic Substances

Element

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