Before 1900, scientists made several breakthroughs about the atom. First, in 450 BC, Leucippus and Democritus were the first people to propose that matter is made of atoms (Doc. 1). Next in 1661, Robert Boyle suggested that chemical elements were the simplest forms of matter(Doc. 1). After that, in
Before 1900, scientists made several breakthroughs about the atom. First, in 450 BC, Leucippus and Democritus were the first people to propose that matter is made of atoms (Doc. 1). Next in 1661, Robert Boyle suggested that chemical elements were the simplest forms of matter(Doc. 1). After that, in