Fluorine
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Fluorine is a chemical element; it has the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as pale yellow diatomic gas. Fluorine is extremely reactive as it
Liquid fluorine (F2 at extremely low temperature)
Fluorite: Pink globular mass with crystal facets
Fluorapatite: Long, prismatic crystal, dull in lustre, protruding, at an angle, from matrix of aggregate-like rock
Cryolite: A parallelogram-shaped outline with diatomic molecules arranged in two layers
Oxygen
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Oxygen is a chemical element; it has the symbol O and its atomic number is 8. It is a member of the chalcogen group in the periodic table. It is highly reactive, a nonmetal, and a potent oxidizing age
Fluorine
…at elevated temperatures for reaction with fluorine to occur, due to the very strong triple bond in elemental nitrogen; ammonia may react explosively. Oxygen does not combine with fluorine under ambient conditions, but can be made to react using electric discharge at low temperatures and pressures; the…
Liquid oxygen (O2 at below −183 °C)
Among several contemporaries who had made discoveries independently from one another, Joseph Priestley was the first to publish his findings on oxygen.
Antoine Lavoisier discredited the phlogiston theory.
Robert H. Goddard and a liquid-oxygen–gasoline rocket