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22 Cards in this Set
- Front
- Back
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The smallest particle of a given type of matter |
Atom |
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The idea that matter is made up of fundamental particles called atoms |
Atomic theory |
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The principle that the elements that comprise a compound are always in certain proportion by mass |
Law of definite proportions- (Proust) |
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A prediction that can be tested to explain observations |
Hypothesis |
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A set of controlled observations that test a hypothesis |
Experiement |
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An explanation based on many observations and supported by the results of many experiments |
Theory |
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A systematic approach used in scientific study; an organized process used by scientists to do research and to verify the work of others |
Scientific method |
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A fact of nature that is observed so often that it is accepted as the truth |
Scientific Law |
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Negatively charged particle |
Electron |
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A positively charged subatomic particle |
Proton |
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Any of two or more atoms of an element that are chemically alike but have different masses |
Isotope |
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A subatomic particle with a mass equal to a proton but with no electrical charge |
Neutron |
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The small, dense, positively charged central core of an atom |
Nucleus |
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The number of protons in the nucleus of an atom of an element |
Atomic number |
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The sum of the neutrons and protons in the nucleus of an atom |
Mass number |
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1/12 of the mass of a carbon-12 atom |
Atomic mass unit |
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The whole range of electromagnetic radiation |
Electromagnetic spectrum |
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The spectrum of light released from excited atoms of an element |
Emission spectrum |
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The regions of space in which electrons can move about the nucleus of an atom |
Energy level |
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The space around the nucleus of an atom where the atom's electrons are found |
Electron cloud |
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An electron in the outermost energy level of an atom |
Valence electron |
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A diagram in which dots or other small symbols are placed around the chemical symbol of an element to illustrate the valence electrons |
Lewis dot diagram |
