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Nuclear

Horizontales
When an element changes to another due to radioactive decay
Stable isotope is forced to decay
The force of repulsion between protons (long range)
Heavy nuclei separate because of neutrons
A particle occupying the nucleus and has protons and neutrons
Verticales
Amount of time it takes for half of a sample to decay
Energy releases, two nuclei becomes one
Atoms that come from the same element but have different masses and number of neutrons
Emits particles and decays into another element
Mass number = protons + nuetrons