関連ワード:  is helium an element compound or mixture    is helium balloon an element compound or mixture    is helium an element compound homogeneous or heterogeneous mixture    is helium an element a compound a solution or a heterogeneous mixture    is helium in a balloon an element compound heterogeneous mixture or homogeneous mixture    classify the substance as an element compound or mixture helium is    is helium an element compound homogeneous or heterogeneous  
結果 : is helium an element compound or mixture