Magnesium combines with oxygen to form magnesium oxide. A 100-gram sample of magnesium combines with 65.8 grams of oxygen. A 10-gram sample of magnesium combines with 6.58 grams of oxygen.
Which point of Dalton’s atomic theory is supported by these findings?
All elements are composed of atoms.
In a particular compound, atoms of different elements always combine in the same way.
All atoms of the same element have the same mass, and atoms of different elements have different masses.