Oxygen

Formula : O2
CAS : 7782-44-7 

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An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.

Argon, Elemental

Formula : Ar
CAS : 7440-37-1 

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A noble gas with the atomic symbol Ar, atomic number 18, and atomic weight 39.948. It is used in fluorescent tubes and wherever an inert atmosphere is desired and nitrogen cannot be used.