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8th Grade Chapter 9 Vocabulary

Across
Atom that is no longer neutral because it has gained or lost an electron
Small area in the center of an atom in which most of the atom's mass and positive charge is concentrated
Atomic particle with a positive charge
Atomic particle with one negative charge
Average mass of an element's isotopes, weighted according to the abundance of each isotope
The number of protons in an atom of an element
Describes elements that spontaneously emit radiation
Down
Neutral particle in the nucleus of an atom
Occurring without external force or cause
Process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation
Area around an atomic nucleus where an electron is most likely to be found
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
Smallest piece of an element that still represents the element