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Chem CH2 Section 1
Chemistry CH2 Section 1 Atoms and Their Structures
| Term | Definition |
|---|---|
| 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 |
Created by:
djhockett5
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