Atoms are made of ____ sub-atomic particles. Protons in an atom are ____ charged particles with a mass of 1 amu. Neutrons have no charge (are ____) and have a mass of 1 amu. Protons and neutrons are found in the ____ of an atom. Electrons have almost no mass and a ____ of -1. The atomic number is the number of ____ in an atom. The ____ number for an atom is obtained when protons and neutrons are added together. Atoms always have the same number of protons as ____ so that they overall have no charge.

Atom Structure

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