The first shell contains 2 electrons, the second 8 electrons, the third 8electrons, the fourth ____ electrons The center of the atom contains protons and ____ The atomic number is the ____ All matter, ____and____ Atoms are the smallest stable unit of matter. ____ What is a rule for making a neutral atom? It has to have the same amount of protons and electrons. ____ What is a rule for determining the mass of an atom? The mass number is the number of protons plus the number of neutrons. ____ To find out the number of neutrons you must subtract the atomic number from the mass number. ____ Protons have a negative charge. ____ Protons don't have a mass. ____ Electrons have a positive charge. ____ Electrons are light or heavy? ____ Neutrons have no charge. ____ Neutrons are light? ____ Compounds are composed of more than 1 type of atom that are bonded together. ____

Atomic structure

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