is it toxic?
No it is not toxic
Phases of solid oxygen
There are six known distinct phases of solid oxygen. One of them is a dark-red cluster. When oxygen is subjected to a pressure of 96 GPa, it becomes metallic, in a similar manner to hydrogen, and becomes more similar to the heavier chalcogens, such as tellurium and polonium, both of which show significant metallic character. At very low temperatures, this phase also becomes superconducting.
oxygen (o2) is formed in photosynthesis as a direct result of Light-driven splitting of water during oxygenic photosynthesis how does lavoisier contribute? He conducted the first adequate quantitative experiments on oxidation and gave the first correct explanation of how combustion works what are its isotopes? They are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number what are its allotropes? UNANSWERABLE how is it stored? UNANSWERABLE
It can be toxic at elevated partial pressures, leading to convulsions and other health problems. It  can be toxic at elevated partial pressures, leading to convulsions and other health problems. Yes, at elevated partial pressures.
Oxygen Oxygen Oxygen
Toxicity Toxicity Toxicity
Oxygen gas () can be toxic at elevated partial pressures, leading to convulsions and other health problems.  Oxygen gas () can be toxic at elevated partial pressures, leading to convulsions and other health problems.  Oxygen gas () can be toxic at elevated partial pressures, leading to convulsions and other health problems. 
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Allotropes of oxygen [SEP] Phases of solid oxygen
There are six known distinct phases of solid oxygen. One of them is a dark-red cluster. When oxygen is subjected to a pressure of 96 GPa, it becomes metallic, in a similar manner to hydrogen, and becomes more similar to the heavier chalcogens, such as tellurium and polonium, both of which show significant metallic character. At very low temperatures, this phase also becomes superconducting.