Which of the following is a compound?, Oxygen, Nitrogen, Water, Hydrogen, Helium, Which of the following is an element, Carbon dioxide, Magnesium Sulfate, Potassium, Hydrogen Peroxide, Water, Which is an element, O, CO2, H2O, H2O2, NaCl, Which is a compound?, Xe, Ar, Cl3, CH4, Na2, A compound is..., Two elements that make one, Two or more different elements combine to make one, The same element more than once, An element with a large subscript, An element is, A pure substance that can not be broken down, a pure substance that can be broken down, a combination of elements, a proton and neutron

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