the total of the masses of the particles in an atom

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

the number of protons in the nucleus of an atom

a negatively charged particle with an extremely small mass

a region in an atom that contains electrons of a certain energy

the splitting of a nucleus

the joining together of smaller nuclei into a larger one

different forms of the same element that have different numbers of neutrons

the sum of the protons and neutrons in the nucleus of an atom; also known as atomic mass

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

the center of an atom, which contains protons and neutrons

regions of most probable location of electrons

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

the emission of rays and particles from an unstable nucleus

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