8th Science - Ch. 7 "Understanding the Atom"
Terms in this set (14)
smallest piece of an element that still represents the element
atomic particle with one negative charge (1-)
area around an atomic nucleus where an electron is most likely to be found
neutral particle in the nucleus of an atom
small area in the center of an atom in which most of an atom's mass and positive charge is concentrated
atomic particle with one positive charge (1+)
the number of protons in an atom of an element
average atomic mass
average mass of an element's isotopes, weighted
according to the abundance of each isotope
atom that is no longer neutral because it has gained or lost electrons
any of two or more atoms of the same element that have different numbers of neutrons
sum of the number of protons and neutrons in an atom
process that occurs when an unstable atomic nucleus changes into another more stable
nucleus by emitting radiation
describes elements that spontaneously emit radiation
occurring without external force or cause
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