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Atoms

Science test on atoms

TermDefinition
density measurable physical property that can be found by dividing the mass of an object by it's volume
matter anything that has a mass and takes up space
atom a very small particle that makes up most kinds of matter and consists of smaller parts called protons, neutrons, and electrons
law of conservation of matter states that matter is not created or destroyed but only changes its form
electron invisible, negatively charged particle located in a cloudlike formation that surrounds the nucleus of an atom
nucleus cell organelle that contains the hereditary material, positively charged, central part of an atom
proton positively charged particle located in the nucleus of an atom and that is counted to identify the atomic number
neutron an uncharged particle located in the nucleus of an atom
mass amount of matter in an object, which is measured in kilograms
element natural or synthetic material that cannot be broken down into simpler materials by ordinary means, has unique properties and is generally classified as a metal, nonmetal, or metalloid
atomic number number of protons in the nucleus of an atom of a given element, is the top number in the periodic table
isotope two or more atoms of the same element that have different numbers of neutrons in their nuclei
mass number sum of the number of protons and neutrons in the nucleus of an atom
atomic mass average mass of an atom of an element, its unit of measure is the atomic mass unit (u), which is 1/12 the mass of a carbon-12 atom
metal element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster
nonmetal elements that are usually gasses or brittle solids and poor conductors of electricity and heat, are the basis of the chemical of life
metalloid element that has characteristics of both metals and nonmetals and is a solid at room temperture
formula shows which elements and how many atoms of each make up a compund
substance matter that has the same composition and properties throughout
compound a substance produced when elements combine and whose properties are different from each of the elements in it
mixture a combination of compounds and elements that has not formed a new substance and whose proportions can be changed without changing the mixtures identity
homogenius the same throughout, can't see the different parts
heterogenius can see the different parts
Created by: 9oscar9