We cannot see atoms directly because they are so ____. However, indirect measurements show us that: The ____ of an atom is about 10-10m (0.000 000 000 1 m). The radius of the ____ is less than 1/10 000 of the radius of the entire atom. Inside the nucleus there are two types of particle: ____ and neutrons. The protons and ____ have approximately the same mass. A proton has a ____ charge and the neutron has ____ charge. Outside the nucleus there are ____ which orbit the nucleus at distances of about 10-10 m. Each proton has a mass of one unit and a charge of ____ Each neutron has a mass of one unit and no charge. Each electron has a charge of ____ and hardly any mass (____).

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