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Ch. 8

Radioactivity

TermDefinition
Radioactivity The spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation
What happens when an atom loses an alpha particle? It changes into an atom of the element two places before it in the periodic table. The mass number of the parent atom decreases by four
When an atom loses a beta particle? It changes into an atom of the element one place after it in the Periodic Table. The mass number stays the same.
The half life of an element The time taken for half of the nuclei in any given sample to decay
Created by: FROmine