Glossary

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compound: A substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. made up of two or more elements and having those elements present in definite proportions; a compoundA substance made up of two or more elements and having those elements present in definite proportions; a compound can be decomposed into two or more different substances. can be decomposed into two or more different substances.

Term of the Day

Abbreviation for curieA unit of radioactive decay; equal to 3.70 x 1010 disintegrations per second; abbreviated Ci., a unitA particular measure of a physical quantity that is used to express the magnitude of the physical quantity; for example, the meter is the unit of the physical quantity, length. of radioactiveDescribes a substance that gives off radiation‐alpha particles, beta particles, or gamma rays‐by the disintegration of its nucleus. decay; equal to 3.70 x 10¹⁰ disintegrations per second.