matter. not terms out there spatial arrangement give matter its properties such as consistency and color. the way we think about atoms today is largely influenced by physicist niels bohr s model according to which electrons orbit the atoms nucleus. a bit like planets orbiting the sun. what atoms can t be seen with the naked eye the thickness of a human hair. is $500000.00 times the diameter of a carbon atom. in the center of the atom is a tiny nucleus containing neutrons which have no electric charge and protons which have a positive charge. 2 2 2 the electrons orbiting outside it are negatively charged the only out of not to have any neutrons is hydrogen it