atom - smallest building block of matter , neutron - has no charge , atomic number - number of +, atomic mass - number of + and neutrons , proton - positive charge , nucleus - has most of an atom's mass, metal - conducts electricity easily , ion - a charged particle , electron - negative charge , element - substance made of the same atom , fusion - when nuclei collide together , fission - when a nucleus is split apart ,

Atomic Energy

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