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Chem CH2 Section 1

Chemistry CH2 Section 1 Atoms and Their Structures

TermDefinition
atom the smallest particle of a given type of matter
atomic mass unit one-twelfth the mass of a carbon-12 atom
atomic number the number of protons in the nucleus of an atom of an element
atomic theory the idea that matter is made up of fundamental particles called atoms
electron negatively charged particle
experiment a set of controlled observations that test a hypothesis
hypothesis a prediction that can be tested to explain observations
isotope any of two or more atoms of an element that are chemically alike but have different masses
law of definite proportions the principle that the elements that comprise a compound are always in a certain proportion by mass
mass number the sum of the neutrons and protons in the nucleus of an atom
neutron a subatomic particle with a mass equal to a proton but with no electrical charge
nucleus the small, dense, positively charged central core of an atom
proton a positively charged subatomic particle
scientific law a fact of nature that is observed so often that it is accepted as the truth
scientific method a systematic approach used in scientific study; an organized process used by scientists to do research and verify the work of others
theory an explanation based on many observations and supported by the results of many experiments