The relative mass of a nucleus is the number of protons ... deuterium (hydrogen-2) and tritium (hydrogen-3): if the atom loses one or more electrons, it becomes a positively-charged ion if the ...

The typical size of atoms and small molecules is around 1 × 10-10 m (0.1 nm). For example: diameter of a hydrogen atom, H 1.0 × 10-10 m width of a hydrogen molecule, H 2 2.9 × 10-10 m ...

The size of the atoms and their mass has a lot to do with the density of the substance Another factor is how the atoms are arranged in the substance. Polyethylene is made up only of carbon and ...