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An element that is an invisible gas is a gold b copper c iron d oxygen
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1 vote
An element that is an invisible gas is

a gold
b copper
c iron
d oxygen

User TheParam
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2 Answers

5 votes
The answer is D. Oxygen.
User Samuel Vidal
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5.0k points
5 votes
The answer to your question is oxygen
User Jdee
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