oxygen

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oxygen
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UFP Historical Society
Symbol O
Atomic Weight 15.9994
Atomic Number 8
Discovered 1774
First Appearance TOS 05 (8 Sep 1966)
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An elemental gas that was required by most humanoid life-forms for breathing. Class M planets all have oxygen-nitrogen atmospheres.[1] Oxygen (element 8) was discovered in England and Sweden on Earth in 1774.[2]

Notes and References