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                                    Select the odd one out lion giraffee Zebra elephant | 
                            
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Answer»  Hydrogen is the CHEMICAL element with the symbol H and ATOMIC NUMBER 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the UNIVERSE, constituting roughly 75% of all baryonic MASS.  | 
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