John Dalton (1766 - 1844) was an English chemist who is primarily known for his atomic theory, which although it is about two centuries old and has progressed in the meantime, is still valid. According to his theory, all elements, matter, are made of atoms, and that all atoms in the given element have the same mass and property, while the compounds are formed from several different types of atoms, where the chemical reaction of two or more elements represents the rearrangement of atoms.
The answer is: B)
