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| is anything that has mass and occupies space. |
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| a small particle that makes up most types of matter and is made up of smaller parts called protons, neutrons, and electrons. |
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| law of conservation of matter |
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| states that matter is neither created nor destroyed, only changed in form. |
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the negatively charged particle found in a cloudlike formation surrouding an atom's nucleus.
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| the positively charged, central part of an atom. |
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| the particle in the nucleus of an atom that carries a positive charge |
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| the uncharged particle in an atom's nucleus |
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| a naturally occuring or synthetic material that cannot be broken down into simpler materials by ordinary means, has a unique set of properties, and that is generally classified as a metal, metalloid, or nonmetal. |
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| the whole number that tells how many protons are in the nucleus of each atom of an element. |
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| the number that tells how heavy an element's atoms are compared with atoms of other elements |
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| are two or more atoms of the same element that have different numbers of neutrons |
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| the sum of an atom's protons and neutrons |
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| are elements that are malleable, ductile, generally have a shiny or metallic luster, and are good conductors of heat and electricity |
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| elements that are usually dull and are poor conductors of heat and electricity |
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| elements that have characteristics of both mettals and nonmetals, generally are brittle and dull, and are poor conductors of heat and electricity |
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| a sample of matter that has the same composition and properties throughout |
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| the pure substance produced when elements combine, and whose properties are different from those of the elements from which it is formed. |
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| law of definite proportions |
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Definition
| states that a given compound is always made of the same elements in the same proportion by mass. |
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| are combinations of two or more substances that have not combined to form ne, pure substances. |
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