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oxygen is a gas having atomic number 8 and it valence is 2 and there are 6 outer most electron
it is place in periodic table having period number 2 and groop number 16
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The evolution of oxygen (02) gas during a reaction can be confirmed by bringing a burning candle near the mouth of the test tube containing the reaction mixture. The intensity of the flame increases because oxygen supports burning. Hydrogen (H2) gas burns with a pop sound when a burning candle is brought near it.
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