what is oxygen?? What is oxygen??
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a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
"if breathing stops, there is no oxygen getting to the brain and the cells begin to die"
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O2 is a non metallic gaseous elements which atomic number is 8 and have is a main factor of combustion it's is main factor for human life.
Characteristics
Colours:- no colour
state- gaseous
Electrons in outer most shell :- 6
Valency- 2
Odour:- no odour
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