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science vocab chap9

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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