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atom a very small particle that makes up most of matter and consists of smaller parts called protons neutrons and electrons atomic mass average mass of an atom of an element; it's unit of measute is the atomic mass unit with is 1/12 the mass of a carbon-12 atom atomic number number of protons in the nucleus of each atom of a given element is the top nubler in each periodic table compound a substance produced when element combine and whose properties are different from each of the elements in it. electron invisible, negatively charged particle located in cloudlike formation that surttound the nucleus of an atom element natural or syntyetic material that canot be vroken down into simple materials by ordinary means; has a unique properties and is generally classified as a metal metallod or nonmetal isotope two or more atoms of the same element that have different numbers of neutrons in the nuclei law conservation of matter states that matter is no tcreated or destriyed but only changes in form mass number sum of the number of protons and neutrons in the nucleus of an atom matter anything that has mass and takes up space and is made up of different kinds of atom uncludes things that can be seen,touched,smell or tasted but does not involve heat sound or light metal element that is malleable ductile a good confuctor of electricity and generally has a shiny or metallic luster metalloiid element that has xharacteristics of both metals and non metals and is a solid at room temperature mixture a combination of substance in which individual substances do not change chemically but instead retain their own individual properties; can be gases solids, liquids or any combination of them neutron an uncharged particle lovated in the nucleus of an atom nonmetal elements that are useually gases or solids and poor conductors of electricity and hecti are the bases of the chemicals of life nucleus positibely charged central part of an atom proton positively charged partivle located in the nucleus of an atom and that is counted on to identify the atomic number substance matter that his the same composition and properties throughout