An atom is so small that a single drop of water contains more than a billion atoms. Although tiny, atoms are mostly empty ...

most of an atom is empty space the diameter of a nucleus can be 100,000 times less than the diameter of an atom The mass of electrons is very small compared to protons and neutrons. Since a ...

There was little change in the understanding of the atom until John Dalton (1766-1844), an English chemist, concluded that: all matter is made of atoms, and atoms are indestructible and cannot be ...