PhySci Ch6

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a unit used to measure the mass of an atom; 1/12 the mass of a carbon-12 atom

the total of the masses of the particles in an atom

the emission of rays and particles from an unstable nucleus

a positively charged particle in the nucleus of an atom; 1836 times heavier than an electron

a neutral particle in the nucleus of an atom, with approximately the same mass as a proton

the joining together of smaller nuclei into a larger one

the splitting of a nucleus

the center of an atom, which contains protons and neutrons