____ is made of atoms. The Sun, the Earth and myself are ____. Atoms are ____ you can not see them with your naked eye. But atoms themselves are made of even ____: protons, neutrons and electrons. ____ are heavy and form small nucleus ____ of an atom. Electrons are light and ____ orbiting the nucleus. This is like planets orbiting the Sun, but much-much smaller! Also, those particles have ____. Proton has a charge of ____, electron has a charge of ____ and neutron has a charge of ____. Plus and minus charges like each other, so they ____, this helps electrons not fly away from nucleus.

E1 Atom structure

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