Answers

2016-03-31T13:12:11+05:30
Oxygen o2.............................
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2016-03-31T13:21:41+05:30
Hydrogen (H2)
Nitrogen (N2)
Oxygen (O2)
Fluorine (F2)
Chlorine (Cl2)
Iodine (I2)
Bromine (Br2)
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