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| the smallest particle of a given type of matter |
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| one-twelfth the mass of a carbon-12 atom |
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| the number of protons in the nucleus of an atom of an element |
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| the idea that matter is made up of fundamental particles called atoms |
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| the whole range of electromagnetic radiation |
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| negatively-charged particle |
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| the space around the nucleus of an atom where the atoms electrons are found |
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| the spectrum of light released from excited atoms of an element |
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Definition
| the regions of space in which electrons can move about the nucleus of an atom |
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| a set of controlled observations that test a hypothesis |
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| a prediction that can be tested to explain observations |
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Definition
| any of two or more atoms of an element that are chemically alike but have different masses |
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| law of definite proportions |
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Definition
| the principle that the elements that comprise a compound are always in a certain proportion by mass |
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Definition
| a diagram where dots or other small symbols are placed around the chemical symbol of an element to illustrate the valence electrons |
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Definition
| the sum of the neutrons and protons in the nucleus of an atom |
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| a subatomic particle with a mass equal to a proton but with no electrical charge |
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| the small, dense, positively charged central core of an atom |
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| a positively charged subatomic particle |
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Definition
| a fact of nature that is observed so often that it is accepted as the truth |
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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 |
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Definition
| an explanation based on many observations and supported by the results of many experiments |
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Definition
| an electron in the outermost energy level of an atom |
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